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

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Message-ID: <20110613135007.GC3049@ubuntu>
Date:	Mon, 13 Jun 2011 14:50:07 +0100
From:	Joe Thornber <thornber@...hat.com>
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, sandeen@...hat.com,
	snitzer@...hat.com, lvm-devel@...hat.com
Subject: Re: [PATCH v1 00/30] Ext4 snapshots

On Mon, Jun 13, 2011 at 04:26:16PM +0300, Amir G. wrote:
> with ext4, snapshots reads may cause extra seeks, but main fs will
> stay optimized for reads.
> with thinp and multisnap, there is no optimization for read from one
> specific target, but I admit that can change in the future when auto defrag
> heuristics are applies to multisnap.

I'm going to keep things symmetrical. A lot of use cases involve
pointing at an arbitrary snapshot and saying "that's now my master".
This is connected to why I support arbitrary depth of recursive
snapshots too.

- Joe
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