[linux-lvm] lvm-vdo, snapshots and cache
g.danti at assyoma.it
Wed Nov 16 14:38:34 UTC 2022
Il 2022-11-16 11:50 Zdenek Kabelac ha scritto:
> Well - as said - vg on vg is basically equivalent of the original LV
> on top of VDO manager.
it seems clunkier to manage two nested VG/LV if you ask me.
> But still these fast snapshot do not solve you a problem of double
> out-of-space fault.
Yeah, but available space requires constant monitor even when dealing
> It's good for experimenting - but I'd not suggest to use this setup.
In RHEL7 it was specifically supported - see here:
"As a general rule, you should place certain storage layers under VDO
and others on top of VDO:
Under VDO: DM-Multipath, DM-Crypt, and software RAID (LVM or mdraid).
On top of VDO: LVM cache, LVM snapshots, and LVM Thin Provisioning"
For a practical example: in the past I experimented with a storage stack
composed of raid -> vdo -> lvmthin -> xfs serving qemu/kvm virtual disk
files. The lvmthin layer enabled rolling snapshots, and was a key
feature of the test setup.
Now the only method to replicate that is to have two nested LVM
instances, one running vdo and one lvmthin - right?
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