Re: lvm-vdo, snapshots and cache
Gionatan Danti <[email protected]>
| Newsgroups | gmane.linux.lvm.general |
|---|---|
| Message-ID | <[email protected]> |
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 > general) Hi Zdenek, 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 > technology... 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 something? > 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... Regards. -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: [email protected] - [email protected] GPG public key ID: FF5F32A8 _______________________________________________ linux-lvm mailing list [email protected] https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/