From: Stuart D Gathman <stuart@bmsi.com>
To: linux-lvm@redhat.com
Subject: Re: [linux-lvm] Fun and games with mirroring
Date: Tue, 22 May 2012 13:57:10 -0400 [thread overview]
Message-ID: <4FBBD376.7070001@bmsi.com> (raw)
In-Reply-To: <53772.172.16.0.29.1337698212.squirrel@beer.org.uk>
Long ago, Nostradamus foresaw that on 05/22/2012 10:50 AM, Vic would write:
> p.s. The reason I want to do this with LVM mirrors rather than MD RAID is
> that this is potentially a very useful way of grabbing a backup snapshot
> of a machine prior to some risky operation - it allows me to "fork" a
> machine onto two sets of media. But if it leaves the result unbootable,
> that's something of a problem...
>
LVM RAID is mainly used for pvmove at the moment. LVM has a ways to go
to match ZFS or AIX in LVM mirroring features. MD RAID takes a
snapshot just fine. Add the mirror with mdadm, sync it, and "fail" the
mirror and remove it before physically removing the drive. I can see
the issue with multiple PVs, however. There is no atomic way to fail
multiple mirrors at once.
next prev parent reply other threads:[~2012-05-22 17:57 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-22 14:50 [linux-lvm] Fun and games with mirroring Vic
2012-05-22 15:27 ` Les Mikesell
2012-05-22 15:29 ` Vic
2012-05-22 16:00 ` Bryn M. Reeves
2012-05-22 16:40 ` Vic
2012-05-22 19:24 ` Brassow Jonathan
2012-05-22 19:59 ` Vic
2012-05-23 8:52 ` Bryn M. Reeves
2012-05-23 10:02 ` Zdenek Kabelac
2012-05-23 15:16 ` Brassow Jonathan
2012-05-23 8:54 ` Bryn M. Reeves
2012-05-23 15:21 ` Les Mikesell
2012-05-23 15:36 ` Bryn M. Reeves
2012-05-23 17:03 ` Les Mikesell
2012-05-23 17:24 ` Bryn M. Reeves
2012-05-23 18:00 ` Les Mikesell
2012-05-23 18:32 ` Stuart D Gathman
2012-05-23 19:07 ` Les Mikesell
2012-05-23 22:39 ` Stuart D Gathman
2012-05-22 17:57 ` Stuart D Gathman [this message]
2012-05-22 18:39 ` tariq wali
2012-05-23 22:44 ` Stuart D Gathman
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