From: Alasdair G Kergon <agk@redhat.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Standard Linux Framework for Snapshot Notification
Date: Fri, 18 Nov 2005 21:56:48 +0000 [thread overview]
Message-ID: <20051118215648.GW26394@agk.surrey.redhat.com> (raw)
In-Reply-To: <64c763540511140550t4de2bbc8scdc58e4d38717a15@mail.gmail.com>
On Mon, Nov 14, 2005 at 07:20:59PM +0530, Block Device wrote:
> I want to know whether Linux provides any standard interface for
> volume managers etc so that applications can register themselves to be
> notified when a snapshot needs to be taken.
Not yet, but it's a reasonable thing to ask for.
> If there isnt any such interface how is consistency guaranteed for
> application data when a snapshot is taken ? eg. How does one take
> (consistent) snapshots of database instances w/o first quiescing them
> ?
At the moment you have to do things the other way around:
quiesce database
lvcreate -s
wake database
There already exists an in-kernel filesystem hook so that mounted filesystems
get the notifications automatically so they can sync their metadata, and
the block devices get flushed.
Alasdair
--
agk@redhat.com
next prev parent reply other threads:[~2005-11-18 21:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-14 13:50 [linux-lvm] Standard Linux Framework for Snapshot Notification Block Device
2005-11-18 21:56 ` Alasdair G Kergon [this message]
2005-11-23 6:29 ` Block Device
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