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Re: [dm-devel] Ext4 and xfs problems in dm-thin on allocation and discar

To: device-mapper development <dm-devel@xxxxxxxxxx>
Subject: Re: [dm-devel] Ext4 and xfs problems in dm-thin on allocation and discard
From: Alasdair G Kergon <agk@xxxxxxxxxx>
Date: Tue, 19 Jun 2012 15:43:16 +0100
Cc: Lukáš Czerner <lczerner@xxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Spelic <spelic@xxxxxxxxxxxxx>
In-reply-to: <20120619141933.GC10637@xxxxxxxxx>
Mail-followup-to: device-mapper development <dm-devel@xxxxxxxxxx>, Lukáš Czerner <lczerner@xxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Spelic <spelic@xxxxxxxxxxxxx>
Organization: Red Hat UK Ltd. Registered in England and Wales, number 03798903. Registered Office: 64 Baker Street, 4th floor, London, W1U 7DF.
References: <4FDF9EBE.2030809@xxxxxxxxxxxxx> <alpine.LFD.2.00.1206191601290.21961@xxxxxxxxxxxxxxxxxxxxxxxxx> <20120619141933.GC10637@xxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)
On Tue, Jun 19, 2012 at 10:19:33AM -0400, Ted Ts'o wrote:
> One of the things which would be nice to be able to easily set up is a
> configuration where we get the benefits of thin provisioning with
> respect to snapshost, but where the underlying block device used by
> the file system is contiguous.  

We're tracking this requirement (for lvm2) here:
  https://bugzilla.redhat.com/show_bug.cgi?id=814737

Alasdair

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