[linux-lvm] lvm-vdo, snapshots and cache
g.danti at assyoma.it
Tue Nov 15 22:41:44 UTC 2022
Il 2022-11-15 22:56 Zdenek Kabelac ha scritto:
> You could try 'vg' on top of another 'vg' - however I'd not recommend
> to use it this way (and it's unssuported (&unsupportable) by lvm2 in
yeah, I would strongly avoid that outside lab testing.
> IMHO I'd not recommend to combine 2 provisioning technologies - it's
> already hard to resolve 'out-of-space' troubles with just one
The issue is that fast snapshots are only provided by dm-thin, meaning
that lvmthin is almost mandatory for implementing a rolling/continuous
snapshot scheme. And, on a more basic level, if we can not stack LVM on
top of a VDO LV (in a supported manner), how can we take a snapshot of
user data residing on that specific volume?
This seems a clear regression vs a separate VDO device. Am I missing
> Caching should be already support - on VDO LV as well as on VDOPOOL LV
> (both work somewhat differently).
Good, thanks for confirming. I will do some tests...
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