VSS\NetBackup\Failover Cluster issue

Question

Hello All,

Last time we implement NetBackup solution. Now from time to time we have cluster failover. In logs I can see some logs regarding VSS. Please check below:

Volume Shadow Copy Service warning: Writer received a Freeze event more than two minutes ago. The writer is still waiting for either an Abort or a Thaw event.

And after this warning we have cluster failover(Event ID 1135):

Event ID 1135
Cluster node ' NODE A ' was removed from the active failover cluster membership. The Cluster service on this node may have stopped.
This could also be due to the node having lost communication with other active nodes in the failover cluster.
Run the Validate a Configuration wizard to check your network configuration.
If the condition persists, check for hardware or software errors related to the network adapters on this node.
Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges.

We checked everything and we was not able to find anything. When we disable backup we don't have this issue.

May I kindly ask you to help me please?

Regards,
Sebastian

Answer 1

Hi,

Thanks for posting on our forum!

Based on your descriptions, it seems that when enabling your third-party backup tool, your network occasionally lose packets. When you disable the tool, this issue disappears, so I guess this third-party tool may take up a lot of bandwidth when it is in the run. In this case, you can:

1) Add an extra network cable
2) Increase cluster heart rate threshold. See:

https://techcommunity.microsoft.com/t5/failover-clustering/tuning-failover-cluster-network-thresholds/ba-p/371834

https://www.virtual-dba.com/blog/always-on-changing-cluster-configuration/

Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.

In addition, you can also check other causes and solutions for this issue through this article:

https://learn.microsoft.com/en-us/windows-server/troubleshoot/troubleshooting-cluster-event-id-1135

Thanks for your support!

BR,
Joan

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