Host-based backup of VMware vSphere VMs.
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Kris1992
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Guest Processing is it important?

Post by Kris1992 »

I can create copy where I have SQL server without Guest Processing, but when i turn on Guest Processing I have:
Unable to release guest. Error: Unfreeze error: [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: [{08695a06-334a-4bb2-a506-033d74b91b04}]. Writer's state: [VSS_WS_FAILED_AT_PREPARE_SNAPSHOT]. Error code: [0x800423f4].]
Any ideas? What I can do with this?
I want to turn on Guest Processing but I don't know how?
foggy
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Re: Guest Processing is it important?

Post by foggy »

Hi Krystian, please contact technical support for a closer investigation. You can also check Windows Event Log for related messages and search this forum for the error code - there are a few threads with similar issues.
Kris1992
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Re: Guest Processing is it important?

Post by Kris1992 »

I wrote to technical support and I waiting 1,5 week to reply, so thanks, but no ......
foggy
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Re: Guest Processing is it important?

Post by foggy »

Could you please share your case ID then? Thanks!
Andreas Neufert
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Re: Guest Processing is it important?

Post by Andreas Neufert » 2 people like this post

03774749
I checked the case and our team was responsive and gave you guidance how to fix it on the Microsoft SQL side. The above is a Microsoft generic issue.
The case was closed with no reponse from customer.

I suggest to open a new case and share the case number here so that we can monitor the case. We can as well escalate the case to match reaction times. A specialist can help with executing the request Microsoft tools.

For those that run into the issue:
There is a Microsoft Repair tool available.
https://www.veeam.com/kb2326

Further tools to investigate the issue:
https://www.veeam.com/kb1789
Kris1992
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Re: Guest Processing is it important?

Post by Kris1992 »

I wrote, i don't have localdb on my server, so what I can do with this situation?
second case: logs don't want to appear
Kris1992
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Re: Guest Processing is it important?

Post by Kris1992 »

And I reply on Your last message
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Re: Guest Processing is it important?

Post by Andreas Neufert »

I will ask the team to reopen the case and contact you.
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Re: Guest Processing is it important?

Post by Andreas Neufert »

Team has opened a new case for you. 03822240
They will have to request log upload again as the old ones were deleted by (time) policy.
Maybe there will be a need to open a Microsoft Case as well as the error is on the Microsoft Software side. Our team will assist you in this case with Microsoft (no fingerpointing).
Regnor
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Re: Guest Processing is it important?

Post by Regnor »

Just a small workaround; I have created a start-script for some VMs which restarts the SQL VSS Service.
This seemed to be much easier then locating the real cause ;)
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Re: Guest Processing is it important?

Post by Andreas Neufert »

Hi Max, thanks for sharing this. Please know that depending on what you restart with the script, you need to add a wait period to it.
When you restart the VSS writers or the VSS framework at all, it will take some time until all the VSS writers are registered again.
If you restart them and then execute the VSS framework it always finish successfull because the writers are not present potentially.
You can check your script and then execute the command
vssadmin list writers (you need to start a CMD in admin mode)
and compare it against the same command before you restart the services to compare the list.
Regnor
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Re: Guest Processing is it important?

Post by Regnor »

Hi Andreas, thanks for your advise. I'll check the affected VMs and see if everything works as expected and/or add a pause to the script.
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