veeam backup vs hyperv suddenly fails (Microsoft Hyperv-V VSS Writer is non-retryable error state)


  • Hi

    2012 r2 hyperv, using veeam backup and replication 9.5 for backups.

    Suddenly backup stopped working an the error that throws:

    1/15/2017 3:19:47 AM :: Unable to allocate processing resources. Error: Writer 'Microsoft Hyper-V VSS Writer' is failed at 'VSS_WS_FAILED_AT_PREPARE_SNAPSHOT'.
    The writer experienced a non-transient error.  If the backup process is retried,
    the error is likely to reoccur.
    --tr:Failed to verify writers state.
    --tr:Failed to perform pre-backup tasks.

    If we run vssadmin list writers on hyperv host we see that Microsoft Hyperv-V VSS Writer is non-retryable error state. If we restart hyperv management service then this error disappears for awhile, until we dont trigger backup again.

    we have even rebooted hyperv host but that did not solve it .

    Please advise


    Sunday, January 15, 2017 11:36 AM

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