From: Daniel Phillips <phillips@phunq.net>
To: Tomasz Chmielewski <mangoo@wpkg.org>
Cc: Zheng Yan <zheng.yan@oracle.com>, linux-btrfs@vger.kernel.org
Subject: Re: snapshot merging?
Date: Tue, 23 Sep 2008 20:34:21 -0700 [thread overview]
Message-ID: <200809232034.21750.phillips@phunq.net> (raw)
In-Reply-To: <48D65ACD.7030907@wpkg.org>
On Sunday 21 September 2008 07:31, Tomasz Chmielewski wrote:
> > Writeable snapshot has been available in btrfs for a long time.
>
> Writeable snapshots and snapshot merging are two different things.
I think what Mikulas really means by "snapshot merging" is what we call
"revert to snapshot" in ddsnap (google Zumastor ddsnap). The latter is
more appropriate terminology IMHO. For a snapshotted volume, this just
requires copying any blocks that belong to the snapshot and not the
origin back to the origin. Similarly, one could revert any snapshot
"back" (quotes because there is not necessarily any relationship in
time) to any other. For a filesystem it will not be nearly so simple,
because at best only part of the job can be done at the physical block
level.
Regards,
Daniel
next prev parent reply other threads:[~2008-09-24 3:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-21 12:22 snapshot merging? Tomasz Chmielewski
2008-09-21 14:19 ` Zheng Yan
2008-09-21 14:31 ` Tomasz Chmielewski
2008-09-21 15:00 ` Zheng Yan
2008-09-24 3:34 ` Daniel Phillips [this message]
2008-09-24 8:54 ` Eric Anopolsky
2008-09-24 10:27 ` Tomasz Torcz
2008-09-24 12:57 ` Chris Mason
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