linux-ext4 - Re: [PATCH v1 00/30] Ext4 snapshots

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Message-ID: <52699.1307746288@turing-police.cc.vt.edu>
Date:	Fri, 10 Jun 2011 18:51:28 -0400
From:	Valdis.Kletnieks@...edu
To:	"Amir G." <amir73il@...rs.sourceforge.net>
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 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)?


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