Execute pre-freeze and post-thaw
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There used to be quiescent snapshot capabilities in older versions (mainly for Windows VSS support), but it has since been removed. I'd say @Team-XAPI-Network knows more about the reason.
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@dinhngtu It's possible to run hooks inside the control domain on different stages of VM lifecycle operations, but these need to be installed beforehand, see https://xapi-project.github.io/new-docs/xenopsd/design/hooks/index.html
I think the vm-pre-suspend is the name of the hook the does this, but I can't confirm it. The docuementation is missing the hook, but it exists in the source code: https://github.com/xapi-project/xen-api/blob/master/ocaml/xenopsd/lib/xenops_hooks.ml#L37
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@psafont Looks like these hooks are for suspend-resume rather than snapshot/backups? I couldn't find any mention of hook calls during the snapshot process
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@dinhngtu said in Execute pre-freeze and post-thaw:
There used to be quiescent snapshot capabilities in older versions (mainly for Windows VSS support), but it has since been removed. I'd say @Team-XAPI-Network knows more about the reason.
We have vmware with ppdm backups and the vss part is actually causing some annoying issues such as quite long io stalls. But I do understand the reason for vss, especially for applications that aren't crash safe.
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@dinhngtu Xenopsd does not have a concept of snapshot. Because I understand that "freezing" the VM means suspending it, I think that the suspend hook will get triggered in any snapshot with memory
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@psafont Freezing/thawing doesn't actually suspend a VM, but it's just a part of the backup process, where I/O operations are quiesced to create a stable view of the on-disk data.
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Could this feature integrate XCP-ng?
We are looking for a new virtualization solution.
Oracle is a bottleneck for backups.We tested the backup with the Veeam agent, which appears to be successful.
However, replication is not possible for this Oracle point via Veeam. -
What is the purpose of this discussion?
You did create this thread, I think you would know what's the purpose of this discussion
Have you asked VEEAM for a solution, because it seems more VEEAM-related question after all
I have no idea what it means regarding "replication is not possible for this Oracle point via VEEAM". Remember we aren't from VEEAM in here, so you should explain more precisely what do you expect from us to do despite it seems to be a VEEAM limitation? -
@olivierlambert said in Execute pre-freeze and post-thaw:
You did create this thread, I think you would know what's the purpose of this discussion
Have you asked VEEAM for a solution, because it seems more VEEAM-related question after all I have no idea what it means regarding "replication is not possible for this Oracle point via VEEAM". Remember we aren't from VEEAM in here, so you should explain more precisely what do you expect from us to do despite it seems to be a VEEAM limitation?
The problem is not Veeam, but the inability to trigger a pre-free and post-thaw (Quiesce) on a VM before and after snapshot on XCP-NG.
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It's not a problem with XO backups
