From: Alasdair G Kergon <agk@redhat.com>
To: Andi Kleen <ak@muc.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] 3/5: Device-mapper: snapshots
Date: Wed, 2 Jun 2004 19:59:24 +0100 [thread overview]
Message-ID: <20040602185924.GS6302@agk.surrey.redhat.com> (raw)
In-Reply-To: <m3r7sx6dip.fsf@averell.firstfloor.org>
On Wed, Jun 02, 2004 at 08:06:06PM +0200, Andi Kleen wrote:
> Alasdair G Kergon <agk@redhat.com> writes:
> > +/*-----------------------------------------------------------------
> > + * Persistent snapshots, by persistent we mean that the snapshot
> > + * will survive a reboot.
> > + *---------------------------------------------------------------*/
As opposed to the transient snapshot which is lost on power down.
> Is this target supposed to be crash safe? What happens when
> the computer crashes while writing to such a volume?
The intention is for snapshot & origin still to be consistent with each other
on disk. (No barriers yet, but some synchronous writes.)
Alasdair
--
agk@redhat.com
next prev parent reply other threads:[~2004-06-02 18:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <22Gkd-1AX-17@gated-at.bofh.it>
2004-06-02 18:06 ` Andi Kleen
2004-06-02 18:59 ` Alasdair G Kergon [this message]
2004-06-02 19:20 ` Andi Kleen
2004-06-02 22:02 ` Alasdair G Kergon
2004-07-03 5:30 ` Daniel Phillips
2004-07-03 6:04 ` Jeff Garzik
2004-07-03 9:09 ` Daniel Phillips
2004-06-02 15:42 Alasdair G Kergon
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