Re: [linux-lvm] lvm-vdo, snapshots and cache
Zdenek Kabelac <[email protected]>
| Newsgroups | dev.linux.lists.linux-lvm |
|---|---|
| Message-ID | <[email protected]> |
Dne 15. 11. 22 v 23:41 Gionatan Danti napsal(a): > 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? Well - as said - vg on vg is basically equivalent of the original LV on top of VDO manager. But still these fast snapshot do not solve you a problem of double out-of-space fault. > This seems a clear regression vs a separate VDO device. Am I missing something? It's good for experimenting - but I'd not suggest to use this setup. Regards Zdenek _______________________________________________ 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/