[linux-lvm] mirror and snapshot incompatible
ml-lvm at hidden.domain.name
Wed Oct 29 00:32:33 UTC 2008
I know how to do it through device-mapper. I'm just worried that maybe
there's a reason why lvm prevents it. Are you aware of such reason, or
is it safe?
Jonathan Brassow wrote:
> It is possible to do all the things you are asking through
> device-mapper... but there is no easy way to do it. (and LVM does not
> yet have the capabilities to manage this yet either.)
> On Oct 27, 2008, at 9:28 PM, Yoav wrote:
>> According to lvcreate, a snapshot of a mirrored volume cannot be
>> created ("Snapshots and mirrors may not yet be mixed"). However,
>> devmapper does not seem to have the same limitation when used
>> directly (not through lvm).
>> Is there a current reason for lvcreate to enforce this rather harsh
>> What are the risks I'm taking by manually creating a dm-snapshot from
>> a dm-mirror device? (of course I'm also replacing the dm-mirror
>> device with a snapshot-origin of the actual dm-mirror device).
>> If there is an actual reason for preventing this, what is the
>> suggested way to consistently backup a mirror volume? Is there a way
>> to temporarily take one of the mirror "legs" (mimage devices)
>> offline in order to back it up, and resync it later?
>> linux-lvm mailing list
>> linux-lvm at redhat.com
>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> linux-lvm mailing list
> linux-lvm at redhat.com
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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