From: Roman Mamedov <rm@romanrm.ru>
To: Zdenek Kaspar <zkaspar82@gmail.com>
Cc: Richard Grundy <richguk@gmail.com>, linux-raid@vger.kernel.org
Subject: Re: mdadm raid5 with lvm: advantages?
Date: Tue, 11 Jan 2011 23:49:45 +0500 [thread overview]
Message-ID: <20110111234945.7c601067@natsu> (raw)
In-Reply-To: <4D2CA32E.3030303@gmail.com>
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On Tue, 11 Jan 2011 19:36:30 +0100
Zdenek Kaspar <zkaspar82@gmail.com> wrote:
> It makes sense to use LVM for virtualization and iSCSI to get rid of big
> file images (unwanted fs overhead/fragmentation). But yes, in some use
> cases this is OK.
Since you mentioned fragmentation - there are ways to both make sparse file
images, and to defragment them when needed (on some filesystems like XFS and
btrfs). But when using LVM instead of file images, the user has neither: LVM
can't have sparse LVs, and it can't (easily) defragment an LV that is
fragmented over one or several PVs. Or am I missing something here?
--
With respect,
Roman
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next prev parent reply other threads:[~2011-01-11 18:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-11 14:06 mdadm raid5 with lvm: advantages? Richard Grundy
2011-01-11 14:10 ` Steven Haigh
2011-01-11 14:13 ` Richard Grundy
2011-01-11 14:16 ` Jan Kasprzak
2011-01-11 16:30 ` CoolCold
2011-01-11 18:36 ` Zdenek Kaspar
2011-01-11 18:40 ` Roberto Spadim
2011-01-11 18:49 ` Roman Mamedov [this message]
2011-01-11 18:58 ` Roy Keene
2011-01-11 19:11 ` Zdenek Kaspar
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