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Aggiornamento - Requirements and Limits for VMs and Hyper-V R2

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E' possibile che siate già a conoscenza del nuovo articolo Technet riguardo il numero massimo di Virtual Machines supportate in un Failover Cluster Windows Server 2008 R2; se non fosse il caso, procediamo con un minimo di cronistoria:

fino a qualche mese fa valeva il principio 64 Virtual Machines attive per Nodo più un Nodo in stand-by (ricordo che il numero massimo di nodi è 16, ricordo anche che un Server "stand-alone" con Hyper-V supporta fino a 384 Virtual Machine attive).

Il cambio è documentato in questo articolo Technet "Requirements and Limits for Virtual Machines and Hyper-V in Windows Server 2008 R2" :

"[...]

   

Nodes per cluster

16

Consider the number of nodes you want to reserve for failover, as well as maintenance tasks such as applying updates. We recommend that you plan for enough resources to allow for 1 node to be reserved for failover, which means it remains idle until another node is failed over to it. (This is sometimes referred to as a passive node.) You can increase this number if you want to reserve additional nodes. There is no recommended ratio or multiplier of reserved nodes to active nodes; the only specific requirement is that the total number of nodes in a cluster cannot exceed the maximum of 16.

Running virtual machines per cluster and per node

1,000 per cluster, with a maximum of 384 on any one node

Several factors can affect the real number of virtual machines that can be run at the same time on one node, such as:

  • Amount of physical memory being used by each virtual machine.
  • Networking and storage bandwidth.
  • Number of disk spindles, which affects disk I/O performance.

 [...]"

Ignorando i colli di bottiglia, si passa quindi al concetto di numero massimo di Virtual Machines per Cluster (1000) allineandosi poi al limite di VMs Hyper-V per singolo nodo. Da notare il consiglio di mantenere 1 Nodo in Stand-By (modello N-1).

 

A presto,

Simone

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Requirements and Limits for Virtual Machines and Hyper-V in Windows Server 2008 R2