linux-kernel - Re: LVM vs. Ext4 snapshots (was: [PATCH v1 00/30] Ext4 snapshots)

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Message-ID: <BANLkTik8Oac+5Ci7Y9VvNUqv-DaYmPkWZA@mail.gmail.com>
Date:	Sat, 11 Jun 2011 12:44:16 +0300
From:	"Amir G." <amir73il@...rs.sourceforge.net>
To:	Alex Bligh <alex@...x.org.uk>
Cc:	Joe Thornber <thornber@...hat.com>,
	Lukas Czerner <lczerner@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, linux-ext4@...r.kernel.org,
	tytso@....edu, linux-kernel@...r.kernel.org, lvm-devel@...hat.com,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: LVM vs. Ext4 snapshots (was: [PATCH v1 00/30] Ext4 snapshots)

On Sat, Jun 11, 2011 at 11:18 AM, Alex Bligh <alex@...x.org.uk> wrote:
>
>
> --On 11 June 2011 08:49:08 +0100 Joe Thornber <thornber@...hat.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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