Re-associate a delta backup
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Hello, how are you? I wanted to make an inquiry regarding DeltaBackup. In a scenario like the following, the hard drives on one xcp-ng host begin to fail and a backup is recovered to another xcp-ng host, it is possible to re-associate the delta backup to the new associated VM to avoid having to do the full backup again? I do not know if I explain myself correctly. If there is already an answer for this, sorry but I couldn't find it.
Greetings
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@mdavico I don't believe this issue has been resolved yet. See prior thread for details and link to Github issue.
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No, you can't because the restored disks will have another UUID. Also, if you made changes on the block, there's no way we can guess the modified blocks to get a coherent VM back on the original host.
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I understand @olivierlambert, the problem occurs when the volume is too large and it takes a long time to make a full copy again considering that there is already a full copy. It occurred to me to modify the UUIDs from xcp-ng, having the original data so that xen-orchestra does not see a modification but I do not know if it will be possible.
Greetings
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I wouldn't go into that direction (messing with UUIDs). Also, what guarantee to do you have about sending the right diff/delta?
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@olivierlambert why should it change if it is a copy of the same delta?
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Just booting the VM on a VDI will change it enough to be "out of sync" (writing/changing blocks on boot). That's the main issue: we can't be 100% sure the delta to apply on the destination is correct or not.
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@olivierlambert thank you
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M mdavico marked this topic as a question on
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M mdavico has marked this topic as solved on
