SQL agent backup fails. But only on certain nodes

[rjv1971]

I have a 4 node SQL cluster running on Windows: 01A, 01B, 01C and 01D.

I want to backup one particular iSCSI disk using a Veeam agent. Agent job is setup as 'failover cluster' mode.

If the instance runs on node 01C (and the disks are all on 01C), the backup fails. If I fail over the instance and it runs on 01A the backup runs fine.


This is the error:

1/6/2021 10:31:16 AM :: Creating VSS snapshot Error: Failed to create snapshot: Backup job failed.
Cannot create a shadow copy of the volumes containing writer's data.
A VSS critical writer has failed. Writer name: [SqlServerWriter]. Class ID: [{a65faa63-5ea8-4ebc-9dbd-a0c4db26912a}]. Instance ID: [{ede1e145-d9ba-4d5c-a320-249a0080d12c}]. Writer's state: [VSS_WS_FAILED_AT_PREPARE_SNAPSHOT]. Error code: [0x800423f0].

Anyone seen this before?

[Dima P.]

Hello Ron,

This behavior should be investigated by our support team. Please raise a case and provide a support case ID for this issue, as requested when you click New Topic. Cheers!