From: NeilBrown <neilb@suse.de>
To: Chris Friesen <chris.friesen@genband.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: RFC: use TRIM data from filesystems to speed up array rebuild?
Date: Wed, 5 Sep 2012 06:21:13 +1000 [thread overview]
Message-ID: <20120905062113.05e4f0f4@notabene.brown> (raw)
In-Reply-To: <50464322.3010509@genband.com>
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On Tue, 04 Sep 2012 12:06:26 -0600 Chris Friesen <chris.friesen@genband.com>
wrote:
>
> Hi,
>
> I'm not really a filesystem guy so this may be a really dumb question.
>
> We currently have an issue where we have a ~1TB RAID1 array that is
> mostly given over to LVM. If we swap one of the disks it will rebuild
> everything, even though we may only be using a small fraction of the space.
>
> This got me thinking. Has anyone given thought to using the TRIM
> information from filesystems to allow the RAID code to maintain a
> bitmask of used disk blocks and only sync the ones that are actually used?
>
> Presumably this bitmask would itself need to be stored on the disk.
>
> Thanks,
> Chris
>
>
Something like this?
http://neil.brown.name/blog/20110216044002#5
NeilBrown
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next prev parent reply other threads:[~2012-09-04 20:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 18:06 RFC: use TRIM data from filesystems to speed up array rebuild? Chris Friesen
2012-09-04 19:11 ` Ric Wheeler
2012-09-04 20:24 ` NeilBrown
2012-09-04 22:59 ` Ric Wheeler
2012-09-06 17:17 ` Benjamin ESTRABAUD
2012-09-06 18:42 ` David Brown
2012-09-07 9:23 ` Benjamin ESTRABAUD
2012-09-04 20:21 ` NeilBrown [this message]
2012-09-04 20:28 ` Chris Friesen
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