From: Nikolay Kichukov <hijacker@oldum.net>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: linux-raid@vger.kernel.org
Subject: Re: data scrubbing
Date: Fri, 29 Jul 2011 16:25:39 +0300 [thread overview]
Message-ID: <4E32B4D3.3030905@oldum.net> (raw)
In-Reply-To: <alpine.DEB.2.00.1107291200580.22537@uplift.swm.pp.se>
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Hi,
This is a good to know!
Just performed a check on a raid1 and got:
Jul 29 15:37:36 hanna64 mdadm[2277]: RebuildFinished event detected on md device /dev/md1, component device mismatches
found: 128
So I presume those mismatches have now been rewritten to both disks successfully. Am I wrong there?
cat /sys/block/md1/md/mismatch_cnt
128
Cheers,
- -Nik
On 07/29/2011 01:03 PM, Mikael Abrahamsson wrote:
> On Fri, 29 Jul 2011, Nikolay Kichukov wrote:
>
>> For example is it good for raid1 array?
>
> Yes, it's good for all raid levels that have any kind of redundancy. You want to read the information on the drives
> regularily to make sure it can still be read, and if it can't, it can be recomputed from parity and written.
>
> Otherwise not-often-read data might have an error on one drive, and then another drive fails and now when you try to
> rebuild you don't have this data anywhere all of a sudden (RAID1 and RAID5), and you had no idea about this.
>
> Scrubbing is good, do it regularily (at least monthly).
>
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next prev parent reply other threads:[~2011-07-29 13:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-29 8:50 data scrubbing Nikolay Kichukov
2011-07-29 10:03 ` Mikael Abrahamsson
2011-07-29 13:25 ` Nikolay Kichukov [this message]
2011-07-29 20:48 ` Beolach
2011-07-29 21:51 ` Mathias Burén
2011-07-29 22:16 ` David Brown
2011-07-29 22:37 ` Beolach
2011-07-29 17:17 ` Thomas Harold
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