Unable to bring CSV volume online on Windows cluster

Sometimes you face weird issue with CSV volume on windows servers; you are unable to bring it online.
This can happen on Windows 2008 R2, 2012, 2012 R2 or 2016 cluster servers. You can follow below steps to isolate the issue.

   1)      Open Disk Management on Server and check whether you are able to see the provisioned storage volume. If you are unable to see it then please check the zoning on SAN storage or ISCSI configuration and make sure the configuration is correct. If you are not the storage admin then contact the storage admin to check the problem. If you still experience the same problem then follow below steps.
   2)      Restart the cluster server one by one; it will help the cluster to properly initialize. It should come online now.
   3)      Check and make sure that proper AV exclusion is configured on all servers, you can follow below article from Microsoft to configure the Antivirus exclusion on a cluster server.

https://support.microsoft.com/en-us/help/250355/antivirus-software-that-is-not-cluster-aware-may-cause-problems-with-c

    4)      Make sure you have not blocked the removable storage on clustered servers from Antivirus software. Because Antivirus application will treat CSV as removable storage and it will not let it come online.
If you have blocked removable storage, then remove the policy from cluster servers and restart the servers. This time you should be able to bring CSV volume online.

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