From: Tim Small <tim@seoss.co.uk>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Jordan Russell <jr-list-2010@quo.to>, linux-raid@vger.kernel.org
Subject: Re: Data-check brings system to a standstill
Date: Fri, 18 Jun 2010 18:10:24 +0100 [thread overview]
Message-ID: <4C1BA880.1050609@seoss.co.uk> (raw)
In-Reply-To: <4C19015B.3020807@tmr.com>
On 16/06/10 17:52, Bill Davidsen wrote:
>> As of kernel 2.6.32 (I didn't see this when I was running 2.6.24-2.6.27
>> previously), the kernel also emits "hung task" warnings every few
>> minutes while the data-check is in progress:
>>
>> # echo check > /sys/block/md1/md/sync_action
>> # cat /var/log/messages
>
Have things switched to AHCI (or similar SATA controller) with NCQ
since? If so, do you drives have buggy firmware which makes them suck
with sequential reads when NCQ is enabled? See the libata wiki for
details - you can try disabling NCQ (or limiting queue depth to 2, or
whatever) to test it....
Tim.
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next prev parent reply other threads:[~2010-06-18 17:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-09 17:30 Data-check brings system to a standstill Jordan Russell
2010-06-16 16:52 ` Bill Davidsen
2010-06-18 16:54 ` Jordan Russell
2010-06-18 17:10 ` Tim Small [this message]
2010-06-18 17:27 ` Jordan Russell
2010-06-22 4:06 ` Jordan Russell
2010-06-22 18:50 ` Bill Davidsen
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