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Date: Sat, 11 Jun 2011 12:44:16 +0300
Message-ID: <BANLkTik8Oac+5Ci7Y9VvNUqv-DaYmPkWZA@mail.gmail.com>
Subject: Re: LVM vs. Ext4 snapshots (was: [PATCH v1 00/30] Ext4 snapshots)
From: "Amir G." <amir73il@users.sourceforge.net>
To: Alex Bligh <alex@alex.org.uk>
Cc: Joe Thornber <thornber@redhat.com>, Lukas Czerner <lczerner@redhat.com>,
        Mike Snitzer <snitzer@redhat.com>, linux-ext4@vger.kernel.org,
        tytso@mit.edu, linux-kernel@vger.kernel.org, lvm-devel@redhat.com,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>
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On Sat, Jun 11, 2011 at 11:18 AM, Alex Bligh <alex@alex.org.uk> wrote:
>
>
> --On 11 June 2011 08:49:08 +0100 Joe Thornber <thornber@redhat.com> wrote:
>
>> I am also convinced multisnap wont be suitable for every use case.
>
> I'm surprised by one thing ext 4 snapshots doesn't seem to do: I would have
> thought the "killer feature" for doing snapshots in the fs rather than in
> the block layer would be the ability to snapshot - and more importantly
> roll back - only parts of the directory hierarchy.
>
> (I've only read the URLs Amir sent, so apologies if I've missed this)
>

No need for apologies.
There is no per-directory snapshot nor rollback with ext4 snpshots.
It is possible to configure a part of the directory hierarchy to be excluded
from future snapshots, but not to delete it selectively from past snapshots.

Amir.
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