linux-kernel - Re: [PATCH v1 00/30] Ext4 snapshots

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Message-ID: <BANLkTik2qGZaKFZwKsHidde+uhS1j+kFuw@mail.gmail.com>
Date:	Sat, 11 Jun 2011 04:09:27 +0300
From:	"Amir G." <amir73il@...rs.sourceforge.net>
To:	Valdis.Kletnieks@...edu
Cc:	Lukas Czerner <lczerner@...hat.com>,
	Yongqiang Yang <xiaoqiangnk@...il.com>,
	linux-ext4@...r.kernel.org, tytso@....edu,
	linux-kernel@...r.kernel.org, sandeen@...hat.com
Subject: Re: [PATCH v1 00/30] Ext4 snapshots

On Sat, Jun 11, 2011 at 1:51 AM,  <Valdis.Kletnieks@...edu> wrote:
> On Thu, 09 Jun 2011 13:54:13 +0300, "Amir G." said:
>
>> Why do you keep saying 'backup only'?
>> There is a huge difference between having long lived snapshots,
>> like CTERA products have, and temporary snapshot for backup
>> purpose (for which LVM is adequate).
>
> I must have blinked somewhere - I'm not convinced LVM is even "adequate" for
> backup purposes.  In particular, how does an LVM-level snapshot deal with the
> "metadata in memory" problem (basically the exact same problem as running fsck
> on a disk partition that is already mounted)?
>
>

It uses the filesystem freeze API.
Same as ext4 snapshots.

Amir.
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