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From: NeilBrown <neilb@suse.de>
To: Manibalan P <pmanibalan@amiindia.co.in>
Cc: linux-raid@vger.kernel.org
Subject: Re: raid6 - data integrity issue - data mis-compare on rebuilding RAID 6 - with 100 Mb resync speed.
Date: Thu, 13 Mar 2014 17:19:02 +1100	[thread overview]
Message-ID: <20140313171902.2a767027@notabene.brown> (raw)
In-Reply-To: <13688C12F44C7C428726663F950CA253094ADEC6@venus.in.megatrends.com>

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On Wed, 12 Mar 2014 13:09:28 +0530 "Manibalan P" <pmanibalan@amiindia.co.in>
wrote:

> >
> >Was the array fully synced before you started the test?
> 
> Yes , IO is started, only after the re-sync is completed.
>  And to add more info,
>              I am facing this mis-compare only with high resync speed
> (30M to 100M), I ran the same test with resync speed min -10M and max -
> 30M, without any issue. So the  issue has relationship with
> sync_speed_max / min.

So presumably it is an interaction between recovery and IO.  Maybe if we
write to a stripe that is being recoverred, or recover a stripe that is being
written to, then something gets confused.

I'll have a look to see what I can find.

Thanks,
NeilBrown

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  reply	other threads:[~2014-03-13  6:19 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-12  7:39 raid6 - data integrity issue - data mis-compare on rebuilding RAID 6 - with 100 Mb resync speed Manibalan P
2014-03-13  6:19 ` NeilBrown [this message]
  -- strict thread matches above, loose matches on Subject: below --
2014-03-24 13:15 Manibalan P
2014-04-11 12:11 Manibalan P
2014-04-23  7:07 ` NeilBrown
2014-04-23 17:02   ` Dan Williams
2014-05-05  7:21     ` NeilBrown
2014-05-16 18:11       ` Dan Williams
2014-05-20  0:22         ` Dan Williams
2014-05-22 11:47           ` Manibalan P
2014-05-22 11:52           ` Manibalan P
2014-04-23  9:19 ` Pasi Kärkkäinen
2014-04-23  9:25   ` Manibalan P
2014-04-23  9:30     ` Pasi Kärkkäinen
2014-04-23  9:33       ` Manibalan P
2014-04-23  9:45         ` Pasi Kärkkäinen
2014-04-23  9:59           ` Manibalan P
2014-04-23 10:03             ` Pasi Kärkkäinen

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