Trusted Contributor.. Yaseen Trusted Contributor..
Trusted Contributor..
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Writer 'Microsoft Hyper-V VSS Writer' failed to prepare files for backup

Can any one help me to troubleshoot vss error I have multiple vm reside on CSV Hyper-V in a cluster environment I am unable to take backup one of them.

1. I tried this under failover cluster integration services uncheck the backup (volume check point) and apply the settings.

back run without any problem when returning back to its original settings same issue backup fails.

with best regards

Yaseen

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Micro Focus Expert
Micro Focus Expert

Re: Writer 'Microsoft Hyper-V VSS Writer' failed to prepare files for backup

Hello @Yaseen

This looks like a problem with VSS. Run this command on the Hyper-V server: vssadmin list writers

If this shows an error you will need to involve your OS support to chek more. 

Andres Fallas Salazar
Customer Support Engineer

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Knowledge Partner
Knowledge Partner

Re: Writer 'Microsoft Hyper-V VSS Writer' failed to prepare files for backup

Hello @Yaseen,

You need to check Application and System eventlog of the Hyper-V host and the VMs. Resolve any issues found there should help.

Regards,
Sebastian Koehler

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Trusted Contributor.. Yaseen Trusted Contributor..
Trusted Contributor..

Re: Writer 'Microsoft Hyper-V VSS Writer' failed to prepare files for backup

FYI
I already checked vss status showing all stable.
But when I run backup that times service starts changing with errors.
I know this issue from os side any idea how to resolve
Thanks
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Micro Focus Expert
Micro Focus Expert

Re: Writer 'Microsoft Hyper-V VSS Writer' failed to prepare files for backup

I found this in some forums: 

Restarting the "Hyper-V Virtual Machine Management" service (Sometimes you need to kill the VMMS.exe process if the service will not stop) will reset the Hyper-V VSS Writer on a host if it gets in a error state.

https://social.technet.microsoft.com/Forums/en-US/3b6e3816-f8d4-4cd5-be25-6727ea4f31a7/how-to-reset-vss-on-hyperv-without-rebooting?forum=winserverhyperv

Maybe can help you. 

If this still happens is better if you contact OS support. 

Andres Fallas Salazar
Customer Support Engineer

If you find that this or any other post resolves your issue, please be sure to mark it as an accepted solution.
If you are satisfied with anyone’s response please remember to give them a LIKE by clicking on the bottom at the left of the post and show your appreciation.
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Knowledge Partner
Knowledge Partner

Re: Writer 'Microsoft Hyper-V VSS Writer' failed to prepare files for backup

Hello @Yaseen,

Is this the same issue as this one or something different? It looks the same to me.

Regards,
Sebastian Koehler

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