From: Zheng Yan <zheng.yan@oracle.com>
To: Tomasz Chmielewski <mangoo@wpkg.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: snapshot merging?
Date: Sun, 21 Sep 2008 22:19:07 +0800 [thread overview]
Message-ID: <48D657DB.7050601@oracle.com> (raw)
In-Reply-To: <48D63C8E.2060802@wpkg.org>
Tomasz Chmielewski wrote:
> At the beginning of August, Mikulas Patocka posted to linux-kernel
> mailing list about adding snapshot merging to LVM[1].
>
> Basicaly, snapshot merging means that it is possible to turn a snapshot
> back into its origin.
>
> Using LVM, however, means that you need to have free place outside of
> the filesystem (i.e., in physical volume) to make snapshots, which is
> not always possible on workstations and some servers.
>
> Is something similar available, or planned, for btrfs? I didn't find
> anything similar on "btrfs design" page in the wiki.
>
Writeable snapshot has been available in btrfs for a long time.
>
> [1] http://kerneltrap.org/Linux/LVM_Snapshot_Merging
>
Writeable snapshot means you can mount/modify snapshots as you like.
In other words, btrfs does snapshot merging automatically.
Yan Zheng
next prev parent reply other threads:[~2008-09-21 14:19 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 [this message]
2008-09-21 14:31 ` Tomasz Chmielewski
2008-09-21 15:00 ` Zheng Yan
2008-09-24 3:34 ` Daniel Phillips
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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