High-availability SAP NetWeaver with simple mount and NFS on SLES for SAP Applications VMs

Article
11/19/2024

This article describes how to deploy and configure Azure virtual machines (VMs), install the cluster framework, and install a high-availability (HA) SAP NetWeaver system with a simple mount structure. You can implement the presented architecture by using one of the following Azure native Network File System (NFS) services:

The simple mount configuration is expected to be the default for new implementations on SLES for SAP Applications 15.

Prerequisites

The following guides contain all the required information to set up a NetWeaver HA system:

SAP S/4 HANA - Enqueue Replication 2 High Availability Cluster With Simple Mount
Use of Filesystem resource for ABAP SAP Central Services (ASCS)/ERS HA setup not possible
SAP Note 1928533, which has:
- A list of Azure VM sizes that are supported for the deployment of SAP software
- Important capacity information for Azure VM sizes
- Supported SAP software, operating systems (OSs), and combinations
- The required SAP kernel version for Windows and Linux on Microsoft Azure
SAP Note 2015553, which lists prerequisites for SAP-supported SAP software deployments in Azure.
SAP Note 2205917, which has recommended OS settings for SUSE Linux Enterprise Server (SLES) for SAP Applications
SAP Note 2178632, which has detailed information about all monitoring metrics reported for SAP in Azure
SAP Note 2191498, which has the required SAP Host Agent version for Linux in Azure
SAP Note 2243692, which has information about SAP licensing on Linux in Azure
SAP Note 2578899, which has general information about SUSE Linux Enterprise Server 15
SAP Note 1275776, which has information about preparing SUSE Linux Enterprise Server for SAP environments
SAP Note 1999351, which has additional troubleshooting information for the Azure Enhanced Monitoring Extension for SAP
SAP community wiki, which has all required SAP Notes for Linux
Azure Virtual Machines planning and implementation for SAP on Linux
Azure Virtual Machines deployment for SAP on Linux
Azure Virtual Machines DBMS deployment for SAP on Linux
SUSE SAP HA best practice guides
SUSE High Availability Extension release notes
Azure Files documentation
NetApp NFS best practices

Overview

This article describes a high-availability configuration for ASCS with a simple mount structure. To deploy the SAP application layer, you need shared directories like /sapmnt/SID, /usr/sap/SID, and /usr/sap/trans, which are highly available. You can deploy these file systems on NFS on Azure Files or Azure NetApp Files.

You still need a Pacemaker cluster to help protect single-point-of-failure components like SAP Central Services (SCS) and ASCS.

Compared to the classic Pacemaker cluster configuration, with the simple mount deployment, the cluster doesn't manage the file systems. This configuration is supported only on SLES for SAP Applications 15 and later. This article doesn't cover the database layer in detail.

The example configurations and installation commands use the following instance numbers.

Instance name	Instance number
ASCS	00
Enqueue Replication Server (ERS)	01
Primary Application Server (PAS)	02
Additional Application Server (AAS)	03
SAP system identifier	NW1

Important

The configuration with simple mount structure is supported only on SLES for SAP Applications 15 and later releases.

Diagram that shows SAP NetWeaver high availability with simple mount and NFS.

Prepare the infrastructure

The resource agent for SAP Instance is included in SUSE Linux Enterprise Server for SAP Applications. An image for SUSE Linux Enterprise Server for SAP Applications 12 or 15 is available in Azure Marketplace. You can use the image to deploy new VMs.

Deploy Linux VMs manually via Azure portal

This document assumes that you've already deployed a resource group, Azure Virtual Network, and subnet.

Deploy virtual machines with SLES for SAP Applications image. Choose a suitable version of SLES image that is supported for SAP system. You can deploy VM in any one of the availability options - virtual machine scale set, availability zone, or availability set.

Configure Azure load balancer

During VM configuration, you have an option to create or select exiting load balancer in networking section. Follow the steps below to configure a standard load balancer for the high-availability setup of SAP ASCS and SAP ERS.

Follow create load balancer guide to set up a standard load balancer for a high availability SAP system using the Azure portal. During the setup of load balancer, consider following points.

Frontend IP Configuration: Create two frontend IP, one for ASCS and another for ERS. Select the same virtual network and subnet as your ASCS/ERS virtual machines.
Backend Pool: Create backend pool and add ASCS and ERS VMs.
Inbound rules: Create two load balancing rule, one for ASCS and another for ERS. Follow the same steps for both load balancing rules.
- Frontend IP address: Select frontend IP
- Backend pool: Select backend pool
- Check "High availability ports"
- Protocol: TCP
- Health Probe: Create health probe with below details (applies for both ASCS or ERS)
  - Protocol: TCP
  - Port: [for example: 620<Instance-no.> for ASCS, 621<Instance-no.> for ERS]
  - Interval: 5
  - Probe Threshold: 2
- Idle timeout (minutes): 30
- Check "Enable Floating IP"

Note

Health probe configuration property numberOfProbes, otherwise known as "Unhealthy threshold" in Portal, isn't respected. So to control the number of successful or failed consecutive probes, set the property "probeThreshold" to 2. It is currently not possible to set this property using Azure portal, so use either the Azure CLI or PowerShell command.

To create Azure standard load balancer for high availability setup of SAP system using Azure CLI, follow below steps.

# Create the load balancer resource and another frontend IP resource for ERS. Allocation of private IP address is dynamic using below command. If you want to pass static IP address, include parameter --private-ip-address.
az network lb create -g MyResourceGroup -n MyLB --sku Standard --vnet-name MyVMsVirtualNetwork --subnet MyVMsSubnet --backend-pool-name MyBackendPool --frontend-ip-name MyASCSFrontendIpName
az network lb frontend-ip create -g MyResourceGroup --lb-name MyLB -n MyERSFrontendIpName --vnet-name MyVMsVirtualNetwork --subnet MyVMsSubnet

# Create the health probe for ASCS and ERS
az network lb probe create -g MyResourceGroup --lb-name MyLB -n MyASCSHealthProbe --protocol tcp --port MyASCSHealthProbePort --interval 5 --probe-threshold 2
az network lb probe create -g MyResourceGroup --lb-name MyLB -n MyERSHealthProbe --protocol tcp --port MyERSHealthProbePort --interval 5 --probe-threshold 2
 
# Create load balancing rule for ASCS and ERS
az network lb rule create -g MyResourceGroup --lb-name MyLB -n MyASCSRuleName --protocol All --frontend-ip-name MyASCSFrontendIpName --frontend-port 0 --backend-pool-name MyBackendPool --backend-port 0 --probe-name MyASCSHealthProbe --idle-timeout-in-minutes 30 --enable-floating-ip 
az network lb rule create -g MyResourceGroup --lb-name MyLB -n MyERSRuleName --protocol All --frontend-ip-name MyERSFrontendIpName --frontend-port 0 --backend-pool-name MyBackendPool --backend-port 0 --probe-name MyERSHealthProbe --idle-timeout-in-minutes 30 --enable-floating-ip  

# Add ASCS and ERS VMs in backend pool
az network nic ip-config address-pool add --address-pool MyBackendPool --ip-config-name ASCSVmIpConfigName --nic-name ASCSVmNicName -g MyResourceGroup --lb-name MyLB
az network nic ip-config address-pool add --address-pool MyBackendPool --ip-config-name ERSVmIpConfigName --nic-name ERSVmNicName -g MyResourceGroup --lb-name MyLB

Expand to view full CLI code

# Define variables for Resource Group, ASCS/ERS VMs.

rg_name="resourcegroup-name"
vm1_name="ascs-vm-name"
vm2_name="ers-vm-name"

# Define variables for the load balancer that will be use in the creation of the load balancer resource.

lb_name="sap-ci-sid-ilb"
bkp_name="ascs-ers-backendpool"
ascs_fip_name="ascs-frontendip"
ers_fip_name="ers-frontendip"

ascs_hp_name="ascs-healthprobe"
ascs_hp_port="62000"
ers_hp_name="ers-healthprobe"
ers_hp_port="62101"

ascs_rule_name="ascs-lb-rule"
ers_rule_name="ers-lb-rule"
 
# Command to get VMs network information like primary NIC name, primary IP configuration name, virtual network name, and subnet name.
 
vm1_primary_nic=$(az vm nic list -g $rg_name --vm-name $vm1_name --query "[?primary == \`true\`].{id:id} || [?primary == \`null\`].{id:id}" -o tsv)
vm1_nic_name=$(basename $vm1_primary_nic)
vm1_ipconfig=$(az network nic ip-config list -g $rg_name --nic-name $vm1_nic_name --query "[?primary == \`true\`].name" -o tsv)
 
vm2_primary_nic=$(az vm nic list -g $rg_name --vm-name $vm2_name --query "[?primary == \`true\`].{id:id} || [?primary == \`null\`].{id:id}" -o tsv)
vm2_nic_name=$(basename $vm2_primary_nic)
vm2_ipconfig=$(az network nic ip-config list -g $rg_name --nic-name $vm2_nic_name --query "[?primary == \`true\`].name" -o tsv)
 
vnet_subnet_id=$(az network nic show -g $rg_name -n $vm1_nic_name --query ipConfigurations[0].subnet.id -o tsv)
vnet_name=$(basename $(dirname $(dirname $vnet_subnet_id)))
subnet_name=$(basename $vnet_subnet_id)
 
# Create the load balancer resource and another frontend IP resource for ERS.
# Allocation of private IP address is dynamic using below command. If you want to pass static IP address, include parameter --private-ip-address. 
  
az network lb create -g $rg_name -n $lb_name --sku Standard --vnet-name $vnet_name --subnet $subnet_name --backend-pool-name $bkp_name --frontend-ip-name $ascs_fip_name
az network lb frontend-ip create -g $rg_name --lb-name $lb_name -n $ers_fip_name --vnet-name $vnet_name --subnet $subnet_name
 
# Create the health probe for ASCS and ERS
 
az network lb probe create -g $rg_name --lb-name $lb_name -n $ascs_hp_name --protocol tcp --port $ascs_hp_port --interval 5 --probe-threshold 2
az network lb probe create -g $rg_name --lb-name $lb_name -n $ers_hp_name --protocol tcp --port $ers_hp_port --interval 5 --probe-threshold 2
 
# Create load balancing rule for ASCS and ERS
  
az network lb rule create -g $rg_name --lb-name $lb_name -n  $ascs_rule_name --protocol All --frontend-ip-name $ascs_fip_name --frontend-port 0 --backend-pool-name $bkp_name --backend-port 0 --probe-name $ascs_hp_name --idle-timeout-in-minutes 30 --enable-floating-ip 
az network lb rule create -g $rg_name --lb-name $lb_name -n  $ers_rule_name --protocol All --frontend-ip-name $ers_fip_name --frontend-port 0 --backend-pool-name $bkp_name --backend-port 0 --probe-name $ers_hp_name --idle-timeout-in-minutes 30 --enable-floating-ip 
 
# Add ASCS and ERS VMs in backend pool
 
az network nic ip-config address-pool add --address-pool $bkp_name --ip-config-name $vm1_ipconfig --nic-name $vm1_nic_name -g $rg_name --lb-name $lb_name
az network nic ip-config address-pool add --address-pool $bkp_name --ip-config-name $vm2_ipconfig --nic-name $vm2_nic_name -g $rg_name --lb-name $lb_name

# [OPTIONAL] Change the assignment of frontend IP address from dynamic to static
afip=$(az network lb frontend-ip show --lb-name $lb_name -g $rg_name -n $ascs_fip_name --query "{privateIPAddress:privateIPAddress}" -o tsv)
az network lb frontend-ip update --lb-name $lb_name -g $rg_name -n $ascs_fip_name --private-ip-address $afip

efip=$(az network lb frontend-ip show --lb-name $lb_name -g $rg_name -n $ers_fip_name --query "{privateIPAddress:privateIPAddress}" -o tsv)
az network lb frontend-ip update --lb-name $lb_name -g $rg_name -n $ers_fip_name --private-ip-address $efip

To create Azure standard load balancer for high availability setup of SAP system using Azure PowerShell, follow below steps.

# Create frontend IP configurations
$ascs_fip = New-AzLoadBalancerFrontendIpConfig -Name MyASCSFrontendIpName -SubnetId MyASCSSubnetName
$ers_fip = New-AzLoadBalancerFrontendIpConfig -Name MyERSFrontendIpName -SubnetId MyERSSubnetName

# Create backend pool
$bePool = New-AzLoadBalancerBackendAddressPoolConfig -Name MyBackendPool

# Create health probes for ASCS and ERS
$ascs_healthprobe = New-AzLoadBalancerProbeConfig -Name MyASCSHealthProbe -Protocol 'tcp' -Port MyASCSHealthProbePort -IntervalInSeconds 5 -ProbeThreshold 2 -ProbeCount 1
$ers_healthprobe = New-AzLoadBalancerProbeConfig -Name $ers_hp_name -Protocol 'tcp' -Port MyASCSHealthProbePort -IntervalInSeconds 5 -ProbeThreshold 2 -ProbeCount 1

# Create load balancing rules for ASCS and ERS
$ascs_rule = New-AzLoadBalancerRuleConfig -Name MyASCSRuleName -Probe $ascs_healthprobe -Protocol 'All' -IdleTimeoutInMinutes 30 -FrontendIpConfiguration $ascs_fip -BackendAddressPool $bePool -EnableFloatingIP
$ers_rule = New-AzLoadBalancerRuleConfig -Name MyERSRuleName -Probe $ers_healthprobe -Protocol 'All' -IdleTimeoutInMinutes 30 -FrontendIpConfiguration $ers_fip -BackendAddressPool $bePool -EnableFloatingIP

# Create the load balancer resource
$lb = New-AzLoadBalancer -ResourceGroupName MyResourceGroup -Name MyLB -Location MyRegion -Sku 'Standard' -FrontendIpConfiguration $ascs_fip, $ers_fip -BackendAddressPool $bePool -LoadBalancingRule $ascs_rule, $ers_rule -Probe $ascs_healthprobe, $ers_healthprobe

Expand to view full PowerShell code

# Define variables for Resource Group, and Database VMs.

$rg_name = 'resourcegroup-name'
$vm1_name = 'ascs-vm-name'
$vm2_name = 'ers-vm-name'

# Define variables for the load balancer that will be utilized in the creation of the load balancer resource.

$lb_name = 'sap-ci-sid-ilb'
$bkp_name = 'ascs-ers-backendpool'
$ascs_fip_name = 'ascs-frontendip'
$ers_fip_name = 'ers-frontendip'
 
$ascs_hp_name = 'ascs-healthprobe'
$ascs_hp_port = '62000'
$ers_hp_name = 'ers-healthprobe'
$ers_hp_port = '62101'
 
$ascs_rule_name = 'ascs-lb-rule'
$ers_rule_name = 'ers-lb-rule'
 
# Command to get VMs network information like NIC name, IP configuration name, Virtual Network name, and Subnet 
 
$vm1 = Get-AzVM -ResourceGroupName $rg_name -Name $vm1_name
$vm1_primarynic = $vm1.NetworkProfile.NetworkInterfaces | Where-Object {($_.Primary -eq "True") -or ($_.Primary -eq $null)}
$vm1_nic_name = $vm1_primarynic.Id.Split('/')[-1]
 
$vm1_nic_info = Get-AzNetworkInterface -Name $vm1_nic_name -ResourceGroupName $rg_name
$vm1_primaryip = $vm1_nic_info.IpConfigurations | Where-Object -Property Primary -EQ -Value "True"
$vm1_ipconfig_name = ($vm1_primaryip).Name
 
$vm2 = Get-AzVM -ResourceGroupName $rg_name -Name $vm2_name
$vm2_primarynic = $vm2.NetworkProfile.NetworkInterfaces | Where-Object {($_.Primary -eq "True") -or ($_.Primary -eq $null)}
$vm2_nic_name = $vm2_primarynic.Id.Split('/')[-1]
 
$vm2_nic_info = Get-AzNetworkInterface -Name $vm2_nic_name -ResourceGroupName $rg_name
$vm2_primaryip = $vm2_nic_info.IpConfigurations | Where-Object -Property Primary -EQ -Value "True"
$vm2_ipconfig_name = ($vm2_primaryip).Name
 
$vnet_name = $vm1_primaryip.Subnet.Id.Split('/')[-3]
$subnet_name = $vm1_primaryip.Subnet.Id.Split('/')[-1]
$location = $vm1.Location
 
# Create frontend IP resource for ASCS and ERS.
# Allocation of private IP address is dynamic using below command. If you want to pass static IP address, include parameter -PrivateIpAddress
 
$ascs_lb_fip = @{
    Name = $ascs_fip_name
    SubnetId = $vm1_primaryip.Subnet.Id
}
$ascs_fip = New-AzLoadBalancerFrontendIpConfig @ascs_lb_fip
 
$ers_lb_fip = @{
    Name = $ers_fip_name
    SubnetId = $vm2_primaryip.Subnet.Id
}
$ers_fip = New-AzLoadBalancerFrontendIpConfig @ers_lb_fip

# Create backend pool
 
$bepool = New-AzLoadBalancerBackendAddressPoolConfig -Name $bkp_name

# Create the health probe for ASCS and ERS
 
$ascs_probe = @{
    Name = $ascs_hp_name
    Protocol = 'tcp'
    Port = $ascs_hp_port
    IntervalInSeconds = '5'
    ProbeThreshold = '2'
    ProbeCount = '1'
}
$ascs_healthprobe = New-AzLoadBalancerProbeConfig @ascs_probe
    
$ers_probe = @{
    Name = $ers_hp_name
    Protocol = 'tcp'
    Port = $ers_hp_port
    IntervalInSeconds = '5'
    ProbeThreshold = '2'
    ProbeCount = '1'
}
$ers_healthprobe = New-AzLoadBalancerProbeConfig @ers_probe

# Create load balancing rule for ASCS and ERS
 
$ascs_lbrule = @{
    Name = $ascs_rule_name
    Probe = $ascs_healthprobe
    Protocol = 'All'
    IdleTimeoutInMinutes = '30'
    FrontendIpConfiguration = $ascs_fip
    BackendAddressPool = $bePool 
} 
$ascs_rule = New-AzLoadBalancerRuleConfig @ascs_lbrule -EnableFloatingIP 
 
$ers_lbrule = @{
    Name = $ers_rule_name
    Probe = $ers_healthprobe
    Protocol = 'All'
    IdleTimeoutInMinutes = '30'
    FrontendIpConfiguration = $ers_fip
    BackendAddressPool = $bePool 
} 
$ers_rule = New-AzLoadBalancerRuleConfig @ers_lbrule -EnableFloatingIP

# Create the load balancer resource
 
$loadbalancer = @{
    ResourceGroupName = $rg_name
    Name = $lb_name
    Location = $location
    Sku = 'Standard'
    FrontendIpConfiguration = $ascs_fip,$ers_fip
    BackendAddressPool = $bePool 
    LoadBalancingRule = $ascs_rule,$ers_rule
    Probe = $ascs_healthprobe,$ers_healthprobe 
} 
$lb = New-AzLoadBalancer @loadbalancer

# Add ASCS and ERS VMs in backend pool of load balanceer
 
$vm1_primaryip.LoadBalancerBackendAddressPools.Add($lb.BackendAddressPools[0])
$vm2_primaryip.LoadBalancerBackendAddressPools.Add($lb.BackendAddressPools[0])
$vm1_nic_info | Set-AzNetworkInterface
$vm2_nic_info | Set-AzNetworkInterface

Note

When VMs without public IP addresses are placed in the back-end pool of an internal (no public IP address) Standard Azure load balancer, there will be no outbound internet connectivity unless you perform additional configuration to allow routing to public endpoints. For details on how to achieve outbound connectivity, see Public endpoint connectivity for virtual machines using Azure Standard Load Balancer in SAP high-availability scenarios.

Important

Don't enable TCP time stamps on Azure VMs placed behind Azure Load Balancer. Enabling TCP timestamps will cause the health probes to fail. Set the net.ipv4.tcp_timestamps parameter to 0. For details, see Load Balancer health probes.
To prevent saptune from changing the manually set net.ipv4.tcp_timestamps value from 0 back to 1, you should update saptune version to 3.1.1 or higher. For more information, see saptune 3.1.1 – Do I Need to Update?.

Deploy NFS

There are two options for deploying Azure native NFS to host the SAP shared directories. You can either deploy an NFS file share on Azure Files or deploy an NFS volume on Azure NetApp Files. NFS on Azure Files supports the NFSv4.1 protocol. NFS on Azure NetApp Files supports both NFSv4.1 and NFSv3.

The next sections describe the steps to deploy NFS. Select only one of the options.

Deploy an Azure Files storage account and NFS shares

NFS on Azure Files runs on top of Azure Files premium storage. Before you set up NFS on Azure Files, see How to create an NFS share.

There are two options for redundancy within an Azure region:

Locally redundant storage (LRS) offers local, in-zone synchronous data replication.
Zone-redundant storage (ZRS) replicates your data synchronously across the three availability zones in the region.

Check if your selected Azure region offers NFSv4.1 on Azure Files with the appropriate redundancy. Review the availability of Azure Files by Azure region for Premium Files Storage. If your scenario benefits from ZRS, verify that premium file shares with ZRS are supported in your Azure region.

We recommend that you access your Azure storage account through an Azure private endpoint. Be sure to deploy the Azure Files storage account endpoint, and the VMs where you need to mount the NFS shares, in the same Azure virtual network or in peered Azure virtual networks.

Deploy an Azure Files storage account named sapnfsafs. This example uses ZRS. If you're not familiar with the process, see Create a storage account for the Azure portal.
On the Basics tab, use these settings:
1. For Storage account name, enter sapnfsafs.
2. For Performance, select Premium.
3. For Premium account type, select FileStorage.
4. For Replication, select Zone redundancy (ZRS).
Select Next.
On the Advanced tab, clear Require secure transfer for REST API. If you don't clear this option, you can't mount the NFS share to your VM. The mount operation will time out.
Select Next.
In the Networking section, configure these settings:
1. Under Networking connectivity, for Connectivity method, select Private endpoint.
2. Under Private endpoint, select Add private endpoint.
On the Create private endpoint pane, select your subscription, resource group, and location. Then make the following selections:
1. For Name, enter sapnfsafs_pe.
2. For Storage sub-resource, select file.
3. Under Networking, for Virtual network, select the virtual network and subnet to use. Again, you can use either the virtual network where your SAP VMs are or a peered virtual network.
4. Under Private DNS integration, accept the default option of Yes for Integrate with private DNS zone. Be sure to select your private DNS zone.
5. Select OK.
On the Networking tab again, select Next.
On the Data protection tab, keep all the default settings.
Select Review + create to validate your configuration.
Wait for the validation to finish. Fix any issues before continuing.
On the Review + create tab, select Create.

Next, deploy the NFS shares in the storage account that you created. In this example, there are two NFS shares, sapnw1 and saptrans.

Sign in to the Azure portal.
Select or search for Storage accounts.
On the Storage accounts page, select sapnfsafs.
On the resource menu for sapnfsafs, select File shares under Data storage.
On the File shares page, select File share, and then:
1. For Name, enter sapnw1, saptrans.
2. Select an appropriate share size. Consider the size of the data stored on the share, I/O per second (IOPS), and throughput requirements. For more information, see Azure file share targets.
3. Select NFS as the protocol.
4. Select No root Squash. Otherwise, when you mount the shares on your VMs, you can't see the file owner or group.

The SAP file systems that don't need to be mounted via NFS can also be deployed on Azure disk storage. In this example, you can deploy /usr/sap/NW1/D02 and /usr/sap/NW1/D03 on Azure disk storage.

Important considerations for NFS on Azure Files shares

When you plan your deployment with NFS on Azure Files, consider the following important points:

The minimum share size is 100 GiB. You pay for only the capacity of the provisioned shares.
Size your NFS shares not only based on capacity requirements, but also on IOPS and throughput requirements. For details, see Azure file share targets.
Test the workload to validate your sizing and ensure that it meets your performance targets. To learn how to troubleshoot performance issues with NFS on Azure Files, consult Troubleshoot Azure file share performance.
For SAP J2EE systems, placing /usr/sap/<SID>/J<nr> on NFS on Azure Files isn't supported.
If your SAP system has a heavy load of batch jobs, you might have millions of job logs. If the SAP batch job logs are stored in the file system, pay special attention to the sizing of the sapmnt share. As of SAP_BASIS 7.52, the default behavior for the batch job logs is to be stored in the database. For details, see Job log in the database.
Deploy a separate sapmnt share for each SAP system.
Don't use the sapmnt share for any other activity, such as interfaces.
Don't use the saptrans share for any other activity, such as interfaces.
Avoid consolidating the shares for too many SAP systems in a single storage account. There are also scalability and performance targets for storage accounts. Be careful to not exceed the limits for the storage account, too.
In general, don't consolidate the shares for more than five SAP systems in a single storage account. This guideline helps you avoid exceeding the storage account limits and simplifies performance analysis.
In general, avoid mixing shares like sapmnt for nonproduction and production SAP systems in the same storage account.
We recommend that you deploy on SLES 15 SP2 or later to benefit from NFS client improvements.
Use a private endpoint. In the unlikely event of a zonal failure, your NFS sessions automatically redirect to a healthy zone. You don't have to remount the NFS shares on your VMs.
If you're deploying your VMs across availability zones, use a storage account with ZRS in the Azure regions that supports ZRS.
Azure Files doesn't currently support automatic cross-region replication for disaster recovery scenarios.

Deploy Azure NetApp Files resources

Check that the Azure NetApp Files service is available in your Azure region of choice.
Create the NetApp account in the selected Azure region. Follow these instructions.
Set up the Azure NetApp Files capacity pool. Follow these instructions.

The SAP NetWeaver architecture presented in this article uses a single Azure NetApp Files capacity pool, Premium SKU. We recommend Azure NetApp Files Premium SKU for SAP NetWeaver application workloads on Azure.
Delegate a subnet to Azure NetApp Files, as described in these instructions.
Deploy Azure NetApp Files volumes by following these instructions. Deploy the volumes in the designated Azure NetApp Files subnet. The IP addresses of the Azure NetApp volumes are assigned automatically.

Keep in mind that the Azure NetApp Files resources and the Azure VMs must be in the same Azure virtual network or in peered Azure virtual networks. This example uses two Azure NetApp Files volumes: sapnw1 and trans. The file paths that are mounted to the corresponding mount points are:
- Volume sapnw1 (nfs://10.27.1.5/sapnw1/sapmntNW1)
- Volume sapnw1 (nfs://10.27.1.5/sapnw1/usrsapNW1)
- Volume trans (nfs://10.27.1.5/trans)

The SAP file systems that don't need to be shared can also be deployed on Azure disk storage. For example, /usr/sap/NW1/D02 and /usr/sap/NW1/D03 could be deployed as Azure disk storage.

Important considerations for NFS on Azure NetApp Files

When you're considering Azure NetApp Files for the SAP NetWeaver high-availability architecture, be aware of the following important considerations:

The minimum capacity pool is 4 tebibytes (TiB). You can increase the size of the capacity pool in 1-TiB increments.
The minimum volume is 100 GiB.
Azure NetApp Files and all virtual machines where Azure NetApp Files volumes are mounted must be in the same Azure virtual network or in peered virtual networks in the same region. Azure NetApp Files access over virtual network peering in the same region is supported. Azure NetApp Files access over global peering isn't yet supported.
The selected virtual network must have a subnet that's delegated to Azure NetApp Files.
The throughput and performance characteristics of an Azure NetApp Files volume is a function of the volume quota and service level, as documented in Service level for Azure NetApp Files. When you're sizing the Azure NetApp Files volumes for SAP, make sure that the resulting throughput meets the application's requirements.
Azure NetApp Files offers an export policy. You can control the allowed clients and the access type (for example, read/write or read-only).
Azure NetApp Files isn't zone aware yet. Currently, Azure NetApp Files isn't deployed in all availability zones in an Azure region. Be aware of the potential latency implications in some Azure regions.
Azure NetApp Files volumes can be deployed as NFSv3 or NFSv4.1 volumes. Both protocols are supported for the SAP application layer (ASCS/ERS, SAP application servers).

Set up ASCS

Next, you'll prepare and install the SAP ASCS and ERS instances.

Create a Pacemaker cluster

Follow the steps in Setting up Pacemaker on SUSE Linux Enterprise Server in Azure to create a basic Pacemaker cluster for SAP ASCS.

Prepare for installation

The following items are prefixed with:

[A]: Applicable to all nodes.
[1]: Applicable to only node 1.
[2]: Applicable to only node 2.

[A] Install the latest version of the SUSE connector.
```
sudo zypper install sap-suse-cluster-connector
```

[A] Install the sapstartsrv resource agent.

sudo zypper install sapstartsrv-resource-agents

[A] Update SAP resource agents.

To use the configuration that this article describes, you need a patch for the resource-agents package. To check if the patch is already installed, use the following command.
```
sudo grep 'parameter name="IS_ERS"' /usr/lib/ocf/resource.d/heartbeat/SAPInstance
```
The output should be similar to the following example.
```
<parameter name="IS_ERS" unique="0" required="0">;
```
If the grep command doesn't find the IS_ERS parameter, you need to install the patch listed on the SUSE download page.

Important

You need to install at least sapstartsrv-resource-agents version 0.91 and resource-agents 4.x from November 2021.

[A] Set up host name resolution.

You can either use a DNS server or modify /etc/hosts on all nodes. This example shows how to use the /etc/hosts file.

sudo vi /etc/hosts

Insert the following lines to /etc/hosts. Change the IP address and host name to match your environment.

 # IP address of cluster node 1
 10.27.0.6    sap-cl1
 # IP address of cluster node 2
 10.27.0.7     sap-cl2
 # IP address of the load balancer's front-end configuration for SAP NetWeaver ASCS
 10.27.0.9   sapascs
 # IP address of the load balancer's front-end configuration for SAP NetWeaver ERS
 10.27.0.10    sapers

[A] Configure the SWAP file.

sudo vi /etc/waagent.conf

# Check if the ResourceDisk.Format property is already set to y, and if not, set it.
ResourceDisk.Format=y

# Set the ResourceDisk.EnableSwap property to y.
# Create and use the SWAP file on the resource disk.
ResourceDisk.EnableSwap=y

# Set the size of the SWAP file with the ResourceDisk.SwapSizeMB property.
# The free space of resource disk varies by virtual machine size. Don't set a value that's too big. You can check the SWAP space by using the swapon command.
ResourceDisk.SwapSizeMB=2000

Restart the agent to activate the change.

sudo service waagent restart

Prepare SAP directories if you're using NFS on Azure Files

[1] Create the SAP directories on the NFS share.

Temporarily mount the NFS share sapnw1 to one of the VMs and create the SAP directories that will be used as nested mount points.

# Temporarily mount the volume.
sudo mkdir -p /saptmp
sudo mount -t nfs sapnfsafs.file.core.windows.net:/sapnfsafs/sapnw1 /saptmp -o noresvport,vers=4,minorversion=1,sec=sys
# Create the SAP directories.
sudo cd /saptmp
sudo mkdir -p sapmntNW1
sudo mkdir -p usrsapNW1
# Unmount the volume and delete the temporary directory.
cd ..
sudo umount /saptmp
sudo rmdir /saptmp

[A] Create the shared directories.

sudo mkdir -p /sapmnt/NW1
sudo mkdir -p /usr/sap/NW1
sudo mkdir -p /usr/sap/trans

sudo chattr +i /sapmnt/NW1
sudo chattr +i /usr/sap/NW1
sudo chattr +i /usr/sap/trans

[A] Mount the file systems.

With the simple mount configuration, the Pacemaker cluster doesn't control the file systems.

echo "sapnfsafs.file.core.windows.net:/sapnfsafs/sapnw1/sapmntNW1 /sapmnt/NW1 nfs noresvport,vers=4,minorversion=1,sec=sys  0  0" >> /etc/fstab
echo "sapnfsafs.file.core.windows.net:/sapnfsafs/sapnw1/usrsapNW1/ /usr/sap/NW1 nfs noresvport,vers=4,minorversion=1,sec=sys  0  0" >> /etc/fstab
echo "sapnfsafs.file.core.windows.net:/sapnfsafs/saptrans /usr/sap/trans nfs noresvport,vers=4,minorversion=1,sec=sys  0  0" >> /etc/fstab   
# Mount the file systems.
mount -a

Prepare SAP directories if you're using NFS on Azure NetApp Files

The instructions in this section are applicable only if you're using Azure NetApp Files volumes with the NFSv4.1 protocol. Perform the configuration on all VMs where Azure NetApp Files NFSv4.1 volumes will be mounted.

[A] Disable ID mapping.

Verify the NFS domain setting. Make sure that the domain is configured as the default Azure NetApp Files domain, defaultv4iddomain.com. Also verify that the mapping is set to nobody.

sudo cat /etc/idmapd.conf
# Examplepython-azure-mgmt-compute
[General]
Verbosity = 0
Pipefs-Directory = /var/lib/nfs/rpc_pipefs
Domain = defaultv4iddomain.com
[Mapping]
Nobody-User = nobody
Nobody-Group = nobody

Verify nfs4_disable_idmapping. It should be set to Y.

To create the directory structure where nfs4_disable_idmapping is located, run the mount command. You won't be able to manually create the directory under /sys/modules, because access is reserved for the kernel and drivers.

# Check nfs4_disable_idmapping. 
cat /sys/module/nfs/parameters/nfs4_disable_idmapping
# If you need to set nfs4_disable_idmapping to Y:
mkdir /mnt/tmp
mount 10.27.1.5:/sapnw1 /mnt/tmp
umount  /mnt/tmp
echo "Y" > /sys/module/nfs/parameters/nfs4_disable_idmapping
# Make the configuration permanent.
echo "options nfs nfs4_disable_idmapping=Y" >> /etc/modprobe.d/nfs.conf

[1] Temporarily mount the Azure NetApp Files volume on one of the VMs and create the SAP directories (file paths).

# Temporarily mount the volume.
sudo mkdir -p /saptmp
# If you're using NFSv3:
sudo mount -t nfs -o rw,hard,rsize=65536,wsize=65536,nfsvers=3,tcp 10.27.1.5:/sapnw1 /saptmp
# If you're using NFSv4.1:
sudo mount -t nfs -o rw,hard,rsize=65536,wsize=65536,nfsvers=4.1,sec=sys,tcp 10.27.1.5:/sapnw1 /saptmp
# Create the SAP directories.
sudo cd /saptmp
sudo mkdir -p sapmntNW1
sudo mkdir -p usrsapNW1
# Unmount the volume and delete the temporary directory.
sudo cd ..
sudo umount /saptmp
sudo rmdir /saptmp

[A] Create the shared directories.

sudo mkdir -p /sapmnt/NW1
sudo mkdir -p /usr/sap/NW1
sudo mkdir -p /usr/sap/trans

sudo chattr +i /sapmnt/NW1
sudo chattr +i /usr/sap/NW1
sudo chattr +i /usr/sap/trans

[A] Mount the file systems.

With the simple mount configuration, the Pacemaker cluster doesn't control the file systems.

# If you're using NFSv3:
echo "10.27.1.5:/sapnw1/sapmntNW1 /sapmnt/NW1 nfs nfsvers=3,hard 0 0" >> /etc/fstab
echo "10.27.1.5:/sapnw1/usrsapNW1 /usr/sap/NW1 nfs nfsvers=3,hard 0 0" >> /etc/fstab
echo "10.27.1.5:/saptrans /usr/sap/trans nfs nfsvers=3,hard 0 0" >> /etc/fstab
# If you're using NFSv4.1:
echo "10.27.1.5:/sapnw1/sapmntNW1 /sapmnt/NW1 nfs nfsvers=4.1,sec=sys,hard 0 0" >> /etc/fstab
echo "10.27.1.5:/sapnw1/usrsapNW1 /usr/sap/NW1 nfs nfsvers=4.1,sec=sys,hard 0 0" >> /etc/fstab
echo "10.27.1.5:/saptrans /usr/sap/trans nfs nfsvers=4.1,sec=sys,hard 0 0" >> /etc/fstab
# Mount the file systems.
mount -a

Install SAP NetWeaver ASCS and ERS

[1] Create a virtual IP resource and health probe for the ASCS instance.

Important

We recommend using the azure-lb resource agent, which is part of the resource-agents package with a minimum version of resource-agents-4.3.0184.6ee15eb2-4.13.1.

sudo crm node standby sap-cl2   
sudo crm configure primitive vip_NW1_ASCS IPaddr2 \
  params ip=10.27.0.9 \
  op monitor interval=10 timeout=20

sudo crm configure primitive nc_NW1_ASCS azure-lb port=62000 \
  op monitor timeout=20s interval=10

sudo crm configure group g-NW1_ASCS nc_NW1_ASCS vip_NW1_ASCS \
  meta resource-stickiness=3000

Make sure that the cluster status is OK and that all resources are started. It isn't important which node the resources are running on.

sudo crm_mon -r
# Node sap-cl2: standby
# Online: [ sap-cl1 ]
#
# Full list of resources:
#
# stonith-sbd     (stonith:external/sbd): Started sap-cl1
# Resource Group: g-NW1_ASCS
#  nc_NW1_ASCS        (ocf::heartbeat:azure-lb):      Started sap-cl1
#  vip_NW1_ASCS       (ocf::heartbeat:IPaddr2):       Started sap-cl1

[1] Install SAP NetWeaver ASCS as root on the first node.

Use a virtual host name that maps to the IP address of the load balancer's front-end configuration for ASCS (for example, sapascs, 10.27.0.9) and the instance number that you used for the probe of the load balancer (for example, 00).

You can use the sapinst parameter SAPINST_REMOTE_ACCESS_USER to allow a non-root user to connect to sapinst. You can use the SAPINST_USE_HOSTNAME parameter to install SAP by using a virtual host name.
```
sudo <swpm>/sapinst SAPINST_REMOTE_ACCESS_USER=sapadmin SAPINST_USE_HOSTNAME=<virtual_hostname>
```
If the installation fails to create a subfolder in /usr/sap/NW1/ASCS00, set the owner and group of the ASCS00 folder and retry.
```
chown nw1adm /usr/sap/NW1/ASCS00
chgrp sapsys /usr/sap/NW1/ASCS00
```

[1] Create a virtual IP resource and health probe for the ERS instance.

sudo crm node online sap-cl2
sudo crm node standby sap-cl1

sudo crm configure primitive vip_NW1_ERS IPaddr2 \
  params ip=10.27.0.10 \
  op monitor interval=10 timeout=20

sudo crm configure primitive nc_NW1_ERS azure-lb port=62101 \
  op monitor timeout=20s interval=10

sudo crm configure group g-NW1_ERS nc_NW1_ERS vip_NW1_ERS

Make sure that the cluster status is OK and that all resources are started. It isn't important which node the resources are running on.

sudo crm_mon -r

# Node sap-cl1: standby
# Online: [ sap-cl2 ]
# 
# Full list of resources:
#
# stonith-sbd     (stonith:external/sbd): Started sap-cl2
#  Resource Group: g-NW1_ASCS
#      nc_NW1_ASCS        (ocf::heartbeat:azure-lb):      Started sap-cl2
#      vip_NW1_ASCS       (ocf::heartbeat:IPaddr2):       Started sap-cl2
#  Resource Group: g-NW1_ERS
#      nc_NW1_ERS (ocf::heartbeat:azure-lb):      Started sap-cl2
#      vip_NW1_ERS  (ocf::heartbeat:IPaddr2):     Started sap-cl2

[2] Install SAP NetWeaver ERS as root on the second node.

Use a virtual host name that maps to the IP address of the load balancer's front-end configuration for ERS (for example, sapers, 10.27.0.10) and the instance number that you used for the probe of the load balancer (for example, 01).

You can use the SAPINST_REMOTE_ACCESS_USER parameter to allow a non-root user to connect to sapinst. You can use the SAPINST_USE_HOSTNAME parameter to install SAP by using a virtual host name.
```
<swpm>/sapinst SAPINST_REMOTE_ACCESS_USER=sapadmin SAPINST_USE_HOSTNAME=virtual_hostname
```
Note

Use SWPM SP 20 PL 05 or later. Earlier versions don't set the permissions correctly, and they cause the installation to fail.

If the installation fails to create a subfolder in /usr/sap/NW1/ERS01, set the owner and group of the ERS01 folder and retry.
```
chown nw1adm /usr/sap/NW1/ERS01
chgrp sapsys /usr/sap/NW1/ERS01
```

[1] Adapt the ASCS instance profile.

sudo vi /sapmnt/NW1/profile/NW1_ASCS00_sapascs

# Change the restart command to a start command.
# Restart_Program_01 = local $(_EN) pf=$(_PF).
Start_Program_01 = local $(_EN) pf=$(_PF)

# Add the following lines.
service/halib = $(DIR_CT_RUN)/saphascriptco.so
service/halib_cluster_connector = /usr/bin/sap_suse_cluster_connector

# Add the keepalive parameter, if you're using ENSA1.
enque/encni/set_so_keepalive = TRUE

For Standalone Enqueue Server 1 and 2 (ENSA1 and ENSA2), make sure that the keepalive OS parameters are set as described in SAP Note 1410736.

Now adapt the ERS instance profile.

sudo vi /sapmnt/NW1/profile/NW1_ERS01_sapers

# Change the restart command to a start command.
# Restart_Program_00 = local $(_ER) pf=$(_PFL) NR=$(SCSID).
Start_Program_00 = local $(_ER) pf=$(_PFL) NR=$(SCSID)

# Add the following lines.
service/halib = $(DIR_CT_RUN)/saphascriptco.so
service/halib_cluster_connector = /usr/bin/sap_suse_cluster_connector

# Remove Autostart from the ERS profile.
# Autostart = 1

[A] Configure keepalive.

Communication between the SAP NetWeaver application server and ASCS is routed through a software load balancer. The load balancer disconnects inactive connections after a configurable timeout.

To prevent this disconnection, you need to set a parameter in the SAP NetWeaver ASCS profile, if you're using ENSA1. Change the Linux system keepalive settings on all SAP servers for both ENSA1 and ENSA2. For more information, read SAP Note1410736.
```
# Change the Linux system configuration.
sudo sysctl net.ipv4.tcp_keepalive_time=300
```

[A] Configure the SAP users after the installation.

# Add sidadm to the haclient group.
sudo usermod -aG haclient nw1adm

[1] Add the ASCS and ERS SAP services to the sapservice file.

Add the ASCS service entry to the second node, and copy the ERS service entry to the first node.

cat /usr/sap/sapservices | grep ASCS00 | sudo ssh sap-cl2 "cat >>/usr/sap/sapservices"
sudo ssh sap-cl2 "cat /usr/sap/sapservices" | grep ERS01 | sudo tee -a /usr/sap/sapservices

[A] Disabling systemd services of the ASCS and ERS SAP instance. This step is only applicable, if SAP startup framework is managed by systemd as per SAP Note 3115048

Note

When managing SAP instances like SAP ASCS and SAP ERS using SLES cluster configuration, you would need to make additional modifications to integrate the cluster with the native systemd-based SAP start framework. This ensures that maintenance procedures do no compromise cluster stability. After installation or switching SAP startup framework to systemd-enabled setup as per SAP Note 3115048, you should disable the systemd services for the ASCS and ERS SAP instances.
```
# Stop ASCS and ERS instances using <sid>adm
sapcontrol -nr 00 -function Stop
sapcontrol -nr 00 -function StopService

sapcontrol -nr 01 -function Stop
sapcontrol -nr 01 -function StopService

# Execute below command on VM where you have performed ASCS instance installation (e.g. sap-cl1)
sudo systemctl disable SAPNW1_00
# Execute below command on VM where you have performed ERS instance installation (e.g. sap-cl2)
sudo systemctl disable SAPNW1_01
```
[A] Enable sapping and sappong. The sapping agent runs before sapinit to hide the /usr/sap/sapservices file. The sappong agent runs after sapinit to unhide the sapservices file during VM boot. SAPStartSrv isn't started automatically for an SAP instance at boot time, because the Pacemaker cluster manages it.
```
sudo systemctl enable sapping
sudo systemctl enable sappong
```
[1] Create SAPStartSrv resource for ASCS and ERS by creating a file and then load the file.
```
vi crm_sapstartsrv.txt
```
Enter below primitive in crm_sapstartsrv.txt file and save
```
primitive rsc_sapstartsrv_NW1_ASCS00 ocf:suse:SAPStartSrv \
 params InstanceName=NW1_ASCS00_sapascs

primitive rsc_sapstartsrv_NW1_ERS01 ocf:suse:SAPStartSrv \
 params InstanceName=NW1_ERS01_sapers
```
Load the file using below command.
```
sudo crm configure load update crm_sapstartsrv.txt
```
Note

If you’ve set up a SAPStartSrv resource using the "crm configure primitive…" command on crmsh version 4.4.0+20220708.6ed6b56f-150400.3.3.1 or later, it’s important to review the configuration of the SAPStartSrv resource primitives. If a monitor operation is present, it should be removed. While SUSE also suggests removing the start and stop operations, but these are not as crucial as the monitor operation. For more information, see recent changes to crmsh package can result in unsupported configuration of SAPStartSrv resource Agent in a SAP NetWeaver HA cluster.

[1] Create the SAP cluster resources.

Depending on whether you are running an ENSA1 or ENSA2 system, select respective tab to define the resources. SAP introduced support for ENSA2, including replication, in SAP NetWeaver 7.52. Starting with ABAP Platform 1809, ENSA2 is installed by default. For ENSA2 support, see SAP Note 2630416.

ENSA1
ENSA2

sudo crm configure property maintenance-mode="true"

# If you're using NFS on Azure Files or NFSv3 on Azure NetApp Files:
sudo crm configure primitive rsc_sap_NW1_ASCS00 SAPInstance \
 op monitor interval=11 timeout=60 on-fail=restart \
 params InstanceName=NW1_ASCS00_sapascs START_PROFILE="/sapmnt/NW1/profile/NW1_ASCS00_sapascs" \
 AUTOMATIC_RECOVER=false MINIMAL_PROBE=true \
 meta resource-stickiness=5000 failure-timeout=60 migration-threshold=1 priority=10

# If you're using NFS on Azure Files or NFSv3 on Azure NetApp Files:
sudo crm configure primitive rsc_sap_NW1_ERS01 SAPInstance \
 op monitor interval=11 timeout=60 on-fail=restart \
 params InstanceName=NW1_ERS01_sapers START_PROFILE="/sapmnt/NW1/profile/NW1_ERS01_sapers" \
 AUTOMATIC_RECOVER=false IS_ERS=true MINIMAL_PROBE=true \
 meta priority=1000

# If you're using NFSv4.1 on Azure NetApp Files:
sudo crm configure primitive rsc_sap_NW1_ASCS00 SAPInstance \
 op monitor interval=11 timeout=105 on-fail=restart \
 params InstanceName=NW1_ASCS00_sapascs START_PROFILE="/sapmnt/NW1/profile/NW1_ASCS00_sapascs" \
 AUTOMATIC_RECOVER=false MINIMAL_PROBE=true \
 meta resource-stickiness=5000 failure-timeout=60 migration-threshold=1 priority=10

# If you're using NFSv4.1 on Azure NetApp Files:
sudo crm configure primitive rsc_sap_NW1_ERS01 SAPInstance \
 op monitor interval=11 timeout=105 on-fail=restart \
 params InstanceName=NW1_ERS01_sapers START_PROFILE="/sapmnt/NW1/profile/NW1_ERS01_sapers" \
 AUTOMATIC_RECOVER=false IS_ERS=true MINIMAL_PROBE=true \
 meta priority=1000

sudo crm configure modgroup g-NW1_ASCS add rsc_sapstartsrv_NW1_ASCS00
sudo crm configure modgroup g-NW1_ASCS add rsc_sap_NW1_ASCS00
sudo crm configure modgroup g-NW1_ERS add rsc_sapstartsrv_NW1_ERS01
sudo crm configure modgroup g-NW1_ERS add rsc_sap_NW1_ERS01

sudo crm configure colocation col_sap_NW1_no_both -5000: g-NW1_ERS g-NW1_ASCS
sudo crm configure location loc_sap_NW1_failover_to_ers rsc_sap_NW1_ASCS00 rule 2000: runs_ers_NW1 eq 1
sudo crm configure order ord_sap_NW1_first_start_ascs Optional: rsc_sap_NW1_ASCS00:start rsc_sap_NW1_ERS01:stop symmetrical=false

sudo crm_attribute --delete --name priority-fencing-delay

sudo crm node online sap-cl1
sudo crm configure property maintenance-mode="false"

Note

If you have a two-node cluster running ENSA2, you have the option to configure priority-fencing-delay cluster property. This property introduces additional delay in fencing a node that has higher total resoure priority when a split-brain scenario occurs. For more information, see SUSE Linux Enteprise Server high availability extension administration guide.

The property priority-fencing-delay is only applicable for ENSA2 running on two-node cluster. For more information, see Enqueue Replication 2 High Availability cluster with simple mount

sudo crm configure property maintenance-mode="true"

sudo crm configure property priority-fencing-delay=30

# If you're using NFS on Azure Files or NFSv3 on Azure NetApp Files:
sudo crm configure primitive rsc_sap_NW1_ASCS00 SAPInstance \
 op monitor interval=11 timeout=60 on-fail=restart \
 params InstanceName=NW1_ASCS00_sapascs START_PROFILE="/sapmnt/NW1/profile/NW1_ASCS00_sapascs" \
 AUTOMATIC_RECOVER=false MINIMAL_PROBE=true \
 meta resource-stickiness=5000 priority=100

# If you're using NFS on Azure Files or NFSv3 on Azure NetApp Files:   
sudo crm configure primitive rsc_sap_NW1_ERS01 SAPInstance \
 op monitor interval=11 timeout=60 on-fail=restart \
 params InstanceName=NW1_ERS01_sapers START_PROFILE="/sapmnt/NW1/profile/NW1_ERS01_sapers" \
 AUTOMATIC_RECOVER=false IS_ERS=true MINIMAL_PROBE=true

# If you're using NFSv4.1 on Azure NetApp Files:
sudo crm configure primitive rsc_sap_NW1_ASCS00 SAPInstance \
 op monitor interval=11 timeout=105 on-fail=restart \
 params InstanceName=NW1_ASCS00_sapascs START_PROFILE="/sapmnt/NW1/profile/NW1_ASCS00_sapascs" \
 AUTOMATIC_RECOVER=false MINIMAL_PROBE=true \
 meta resource-stickiness=5000 priority=100

# If you're using NFSv4.1 on Azure NetApp Files:   
sudo crm configure primitive rsc_sap_NW1_ERS01 SAPInstance \
 op monitor interval=11 timeout=105 on-fail=restart \
 params InstanceName=NW1_ERS01_sapers START_PROFILE="/sapmnt/NW1/profile/NW1_ERS01_sapers" \
 AUTOMATIC_RECOVER=false IS_ERS=true MINIMAL_PROBE=true

sudo crm configure modgroup g-NW1_ASCS add rsc_sapstartsrv_NW1_ASCS00
sudo crm configure modgroup g-NW1_ASCS add rsc_sap_NW1_ASCS00
sudo crm configure modgroup g-NW1_ERS add rsc_sapstartsrv_NW1_ERS01
sudo crm configure modgroup g-NW1_ERS add rsc_sap_NW1_ERS01

sudo crm configure colocation col_sap_NW1_no_both -5000: g-NW1_ERS g-NW1_ASCS
sudo crm configure order ord_sap_NW1_first_start_ascs Optional: rsc_sap_NW1_ASCS00:start rsc_sap_NW1_ERS01:stop symmetrical=false

sudo crm node online sap-cl1
sudo crm configure property maintenance-mode="false"

If you're upgrading from an older version and switching to ENSA2, see SAP Note 2641019.

Make sure that the cluster status is OK and that all resources are started. It isn't important which node the resources are running on.

sudo crm_mon -r
# Full list of resources:
# 
# stonith-sbd     (stonith:external/sbd): Started sap-cl2
#  Resource Group: g-NW1_ASCS
#      nc_NW1_ASCS        (ocf::heartbeat:azure-lb):      Started sap-cl1
#      vip_NW1_ASCS       (ocf::heartbeat:IPaddr2):       Started sap-cl1
#      rsc_sapstartsrv_NW1_ASCS00 (ocf::suse:SAPStartSrv):        Started sap-cl1
#      rsc_sap_NW1_ASCS00 (ocf::heartbeat:SAPInstance):   Started sap-cl1
#  Resource Group: g-NW1_ERS
#      nc_NW1_ERS (ocf::heartbeat:azure-lb):      Started sap-cl2
#      vip_NW1_ERS        (ocf::heartbeat:IPaddr2):       Started sap-cl2
#      rsc_sapstartsrv_NW1_ERS01  (ocf::suse:SAPStartSrv):        Started sap-cl2
#      rsc_sap_NW1_ERS01  (ocf::heartbeat:SAPInstance):   Started sap-cl1

Prepare the SAP application server

Some databases require you to execute the database installation on an application server. Prepare the application server VMs to be able to execute the database installation.

The following common steps assume that you install the application server on a server that's different from the ASCS and HANA servers:

Set up host name resolution.

You can either use a DNS server or modify /etc/hosts on all nodes. This example shows how to use the /etc/hosts file.

sudo vi /etc/hosts

Insert the following lines to /etc/hosts. Change the IP address and host name to match your environment.

10.27.0.6   sap-cl1
10.27.0.7   sap-cl2
# IP address of the load balancer's front-end configuration for SAP NetWeaver ASCS
10.27.0.9   sapascs
# IP address of the load balancer's front-end configuration for SAP NetWeaver ERS
10.27.0.10  sapers
10.27.0.8   sapa01
10.27.0.12  sapa02

Configure the SWAP file.

sudo vi /etc/waagent.conf

# Set the ResourceDisk.EnableSwap property to y.
# Create and use the SWAP file on the resource disk.
ResourceDisk.EnableSwap=y

# Set the size of the SWAP file by using the ResourceDisk.SwapSizeMB property.
# The free space of the resource disk varies by virtual machine size. Don't set a value that's too big. You can check the SWAP space by using the swapon command.
ResourceDisk.SwapSizeMB=2000

Restart the agent to activate the change.

sudo service waagent restart

Prepare SAP directories

If you're using NFS on Azure Files, use the following instructions to prepare the SAP directories on the SAP application server VMs:

Create the mount points.

sudo mkdir -p /sapmnt/NW1
sudo mkdir -p /usr/sap/trans

sudo chattr +i /sapmnt/NW1
sudo chattr +i /usr/sap/trans

Mount the file systems.

echo "sapnfsafs.file.core.windows.net:/sapnfsafs/sapnw1/sapmntNW1 /sapmnt/NW1  nfs noresvport,vers=4,minorversion=1,sec=sys  0  0" >> /etc/fstab
echo "sapnfsafs.file.core.windows.net:/sapnfsafs/saptrans /usr/sap/trans  nfs noresvport,vers=4,minorversion=1,sec=sys  0  0" >> /etc/fstab   
# Mount the file systems.
mount -a

If you're using NFS on Azure NetApp Files, use the following instructions to prepare the SAP directories on the SAP application server VMs:

Create the mount points.

sudo mkdir -p /sapmnt/NW1
sudo mkdir -p /usr/sap/trans

sudo chattr +i /sapmnt/NW1
sudo chattr +i /usr/sap/trans

Mount the file systems.

# If you're using NFSv3:
echo "10.27.1.5:/sapnw1/sapmntNW1 /sapmnt/NW1 nfs nfsvers=3,hard 0 0" >> /etc/fstab
echo "10.27.1.5:/saptrans /usr/sap/trans nfs nfsvers=3, hard 0 0" >> /etc/fstab
# If you're using NFSv4.1:
echo "10.27.1.5:/sapnw1/sapmntNW1 /sapmnt/NW1 nfs nfsvers=4.1,sec=sys,hard 0 0" >> /etc/fstab    
echo "10.27.1.5:/saptrans /usr/sap/trans nfs nfsvers=4.1,sec=sys,hard 0 0" >> /etc/fstab
# Mount the file systems.
mount -a

Install the database

In this example, SAP NetWeaver is installed on SAP HANA. You can use any supported database for this installation. For more information on how to install SAP HANA in Azure, see High availability of SAP HANA on Azure virtual machines. For a list of supported databases, see SAP Note 1928533.

Install the SAP NetWeaver database instance as root by using a virtual host name that maps to the IP address of the load balancer's front-end configuration for the database. You can use the SAPINST_REMOTE_ACCESS_USER parameter to allow a non-root user to connect to sapinst.

sudo <swpm>/sapinst SAPINST_REMOTE_ACCESS_USER=sapadmin

Install the SAP NetWeaver application server

Follow these steps to install an SAP application server:

[A] Prepare the application server.

Follow the steps in SAP NetWeaver application server preparation.
[A] Install a primary or additional SAP NetWeaver application server.

You can use the SAPINST_REMOTE_ACCESS_USER parameter to allow a non-root user to connect to sapinst.
```
sudo <swpm>/sapinst SAPINST_REMOTE_ACCESS_USER=sapadmin
```
[A] Update the SAP HANA secure store to point to the virtual name of the SAP HANA system replication setup.

Run the following command to list the entries.
```
hdbuserstore List
```
The command should list all entries and should look similar to this example.
```
DATA FILE       : /home/nw1adm/.hdb/sapa01/SSFS_HDB.DAT
KEY FILE        : /home/nw1adm/.hdb/sapa01/SSFS_HDB.KEY

KEY DEFAULT 
  ENV : 10.27.0.4:30313
  USER: SAPABAP1
  DATABASE: NW1
```
In this example, the IP address of the default entry points to the VM, not the load balancer. Change the entry to point to the virtual host name of the load balancer. Be sure to use the same port and database name. For example, use 30313 and NW1 in the sample output.
```
su - nw1adm
hdbuserstore SET DEFAULT nw1db:30313@NW1 SAPABAP1 <password of ABAP schema>
```

Test your cluster setup

Thoroughly test your Pacemaker cluster. Run the typical failover tests.

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High-availability SAP NetWeaver with simple mount and NFS on SLES for SAP Applications VMs

Prerequisites

Overview

Prepare the infrastructure

Deploy Linux VMs manually via Azure portal

Configure Azure load balancer

Deploy NFS

Deploy an Azure Files storage account and NFS shares

Important considerations for NFS on Azure Files shares

Deploy Azure NetApp Files resources

Important considerations for NFS on Azure NetApp Files

Set up ASCS

Create a Pacemaker cluster

Prepare for installation

Prepare SAP directories if you're using NFS on Azure Files

Prepare SAP directories if you're using NFS on Azure NetApp Files

Install SAP NetWeaver ASCS and ERS

Prepare the SAP application server

Prepare SAP directories

Install the database

Install the SAP NetWeaver application server

Test your cluster setup

Next steps

Feedback

Additional resources