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Failover Cluster Shows Quarantined node but everything is working ok.

Jodiethedog 0 Reputation points
2025-01-16T10:11:20.8266667+00:00

Hi All.

We have 2x 2022 HyperV servers with a clustered SQL server running on each host.

Yesterday i shut down all the vm's on Host 2 and patched it to latest firmware etc. When I brought the SQL servers back up, SQL Server 2 in the failover cluster was in a state of "Quarantined" and had a red arrow. Also the Always on HA replication was not working.

So, i ran Start-ClusterNode -ClearQuarantine powershell command on SQL2. Now SQL2 is showing a green arrow and always on HA is working properly. All green.

But, the Failover Cluster still shows Quarantined. Its almost like I just need to reset the state or something. Does anyone have any ideas? Thanks.

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A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
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Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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Windows Server Clustering
Windows Server Clustering
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Clustering: The grouping of multiple servers in a way that allows them to appear to be a single unit to client computers on a network. Clustering is a means of increasing network capacity, providing live backup in case one of the servers fails, and improving data security.
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  1. Ian Xue 39,281 Reputation points Microsoft Vendor
    2025-01-20T07:52:56.5766667+00:00

    Hi Jodiethedog,

    Thanks for your post. Yes, quarantined nodes are just that; their roles are drained to other nodes in the cluster and they are not allowed to rejoin the cluster for two hours. The idea is to stop failing nodes from bouncing up and down (so called flapping), joining and leaving the cluster over and over again causing performance issues.

    To force the node to normal state, on quarantine node open Windows powershell to execute cmd

    Start-ClusterNode  -name <Quarantined Server>  –ClearQuarantine

    Detailed information here: SOLVED: What is Quarantine in a Server 2016 Cluster & How Can a Node be Moved Out of Quarantine?

    Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

    Best Regards,

    Ian Xue

    If the Answer is helpful, please click "Accept Answer" and upvote it.

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