Full backups: Why is it not possible to use NBD on full backups ?
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Hello forum...
On delta backups we can use CBT and NBD to speed backups. Why is it not possible to use NBD on full backups ?
just curious...Thank you,
Pedro -
From reading the code with bad glasses rather than from knowing (out of my league, by far
) : my partial understanding is that full and incremental backups don't leave the host by the same route.
FullXapi.mjscallsVM.exportonce and gets back a single XVA tar archive for the whole VM, while the incremental runner callsexportIncrementalVmper disk, and it's that per-disk call that carries thepreferNbdoption. GreppreferNbdacross@xen-orchestra/backupsand you get five files, all of them on the incremental side.So my guess, and it' a wild one, is that the two shapes just don't fit: NBD hands you one VDI at a time, and a full backup is asking for the whole VM in one archive.
I've no idea whether anyone has looked at changing that, so might be worth a mention to @Team-XO-Backend, who would actually know.
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P poddingue marked this topic as a question
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That should be it, tks @poddingue
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