Discussions specific to the VMware vSphere hypervisor
Gostev
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by Gostev » Sep 11, 2019 10:52 pm

mkretzer wrote:
Sep 11, 2019 5:00 pm
@Gostev: To be honest that would be simple an genious. Please implement this and make it possible to turn it off :-)
No worries. In Veeam, there's a registry key for everything!

matthewingram
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by matthewingram » Sep 12, 2019 5:01 pm

another helpful change maybe to allow us to run a active full of an individual VM within a job.

Gostev
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by Gostev » Sep 12, 2019 10:23 pm

This will require some quite major job architecture, which is planned - but this requires a major release runway, so not something we can add last minute to v10.

doum
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by doum » Sep 13, 2019 7:31 am

Gostev wrote:
Sep 10, 2019 4:37 pm
By the way, based on these events we're now looking at adding one last minute feature to v10: automatic CBT reset on each VM when Active Full backup is performed. Looking back at the past few CBT bugs, having this would have helped everyone to make sure they have a good backup without having to mess with CBT reset scripts.
better than nothing but doesn't solve the problem if you don't use active full, and for all the backup between a revert to snapshot (monday for example) and an active full (sunday)

doum
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by doum » Sep 13, 2019 7:34 am

matthewingram wrote:
Sep 12, 2019 5:01 pm
another helpful change maybe to allow us to run a active full of an individual VM within a job.
and reset the CBT before the active full :D

the best thing though would be for vmware to fix this huge bug "by design" and automatically reset the CBT when you revert a snapshot

Gostev
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by Gostev » Sep 13, 2019 2:15 pm

Currently, their intention is to disable CBT following snapshot revert.

Regnor
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by Regnor » Sep 16, 2019 6:16 am

Gostev wrote:
Sep 10, 2019 4:37 pm
By the way, based on these events we're now looking at adding one last minute feature to v10: automatic CBT reset on each VM when Active Full backup is performed. Looking back at the past few CBT bugs, having this would have helped everyone to make sure they have a good backup without having to mess with CBT reset scripts.
This sounds like a great idea; +1 ;)
I already thought of regulary disabling CBT for every customer because of all the bugs.

omerlin98000
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by omerlin98000 » Sep 16, 2019 6:50 am

Hello all :)

One question is still in my mind:
- what an "Active Full backup" has to do with CBT (correct or corrupted)? I thought an Active full will ignore CBT by design and has to read ALL blocks from scratch?
- if Active full is sufficient, why do I have to reset CBT by script?

Of course, I have some jobs with incremental forever, those are now suspicious to me.
And yes, if I do a revert snapshot, it will be my responsibility to force Active full for the next backup job (event it is an incremental that very day).

Do I understand well?

mkh
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by mkh » Sep 16, 2019 7:02 am

please keep the "automatic CBT reset on active full" even if vmware arrived with patches before v10. It will give so much more peace of mind.

jb238
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by jb238 » Sep 16, 2019 8:19 am

Gostev wrote:
Sep 10, 2019 4:37 pm
By the way, based on these events we're now looking at adding one last minute feature to v10: automatic CBT reset on each VM when Active Full backup is performed. Looking back at the past few CBT bugs, having this would have helped everyone to make sure they have a good backup without having to mess with CBT reset scripts.
I would like that. Data integrity is by far the most important, speed a distant second. Maybe implement a switch to turn it off if in some environtments the performance impact is significant.

mma
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Re: Forum Digest: CBT bug - Snapshot revert issues

Post by mma » Sep 16, 2019 1:50 pm

Keep in mind that some VMs might be in more than one job. CBT reset at active full is not optimal in this case.

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