From: John Robinson <john.robinson@anonymous.org.uk>
To: SandeepKsinha <sandeepksinha@gmail.com>
Cc: Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: RAID5 reconstruction ?
Date: Sat, 30 May 2009 14:35:14 +0100 [thread overview]
Message-ID: <4A213612.7080206@anonymous.org.uk> (raw)
In-Reply-To: <37d33d830905292244w685499b3h391aa2ca7a5b1ad@mail.gmail.com>
On 30/05/2009 06:44, SandeepKsinha wrote:
> Hi all,
>
> Say If I have a RAID 5 array of 50GB of five disks of 10GB each.
>
> I have data of 5GB. When a disk fails and replaced with a spare disk.
> Will the reconstruction happen only for the 5GB allocated disk blocks
> or it will happen for the whole disk size.
The whole disc size, for now anyway; md does not currently note which
blocks have been used by its client (the filesystem, LVM, whatever).
> Is it possible to make reconstruction intelligent enough to keep it optimized ?
This has been discussed in combination with supporting SSD drives' TRIM
function, and would mean md had to keep track of used chunks or possibly
even sectors using a bitmap or something like that, but whether anyone's
working on it I don't know.
Cheers,
John.
next prev parent reply other threads:[~2009-05-30 13:35 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-30 5:44 RAID5 reconstruction ? SandeepKsinha
2009-05-30 12:52 ` Sujit Karataparambil
2009-05-30 13:28 ` SandeepKsinha
2009-05-30 13:31 ` Sujit Karataparambil
2009-06-09 4:13 ` Nifty Fedora Mitch
2009-05-30 13:35 ` John Robinson [this message]
2009-05-30 14:06 ` Maxime Boissonneault
2009-05-30 15:46 ` John Robinson
2009-05-30 16:16 ` Maxime Boissonneault
2009-05-30 16:30 ` John Robinson
2009-05-30 16:08 ` Redeeman
2009-05-30 18:39 ` Bill Davidsen
2009-05-30 18:54 ` Goswin von Brederlow
2009-05-31 8:10 ` SandeepKsinha
2009-05-30 18:55 ` Goswin von Brederlow
2009-05-30 19:37 ` Redeeman
2009-05-31 8:02 ` SandeepKsinha
2009-05-31 11:54 ` Goswin von Brederlow
2009-05-31 12:11 ` John Robinson
2009-05-31 12:14 ` NeilBrown
2009-06-03 1:54 ` Greg Freemyer
2009-06-02 18:42 ` Bill Davidsen
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