linux-kernel - Re: 2.6.23.1: mdadm/raid5 hung/d-state

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Date:	Tue, 6 Nov 2007 06:42:45 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	BERTRAND Joël <joel.bertrand@...tella.fr>
cc:	Dan Williams <dan.j.williams@...el.com>,
	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org
Subject: Re: 2.6.23.1: mdadm/raid5 hung/d-state



On Tue, 6 Nov 2007, BERTRAND Joël wrote:

> Justin Piszcz wrote:
>> 
>> 
>> On Tue, 6 Nov 2007, BERTRAND Joël wrote:
>>
>>>     Done. Here is obtained ouput :
>>> 
>>> [ 1265.899068] check 4: state 0x6 toread 0000000000000000 read 
>>> 0000000000000000 write fffff800fdd4e360 written 0000000000000000
>>> [ 1265.941328] check 3: state 0x1 toread 0000000000000000 read 
>>> 0000000000000000 write 0000000000000000 written 0000000000000000
>>> [ 1265.972129] check 2: state 0x1 toread 0000000000000000 read 
>>> 0000000000000000 write 0000000000000000 written 0000000000000000
>>> 
>>>
>>>     For information, after crash, I have :
>>> 
>>> Root poulenc:[/sys/block] > cat /proc/mdstat
>>> Personalities : [raid1] [raid6] [raid5] [raid4]
>>> md_d0 : active raid5 sdc1[0] sdh1[5] sdg1[4] sdf1[3] sde1[2] sdd1[1]
>>>      1464725760 blocks level 5, 64k chunk, algorithm 2 [6/6] [UUUUUU]
>>>
>>>     Regards,
>>>
>>>     JKB
>> 
>> After the crash it is not 'resyncing' ?
>
> 	No, it isn't...
>
> 	JKB
>

After any crash/unclean shutdown the RAID should resync, if it doesn't, 
that's not good, I'd suggest running a raid check.

The 'repair' is supposed to clean it, in some cases (md0=swap) it gets 
dirty again.

Tue May  8 09:19:54 EDT 2007: Executing RAID health check for /dev/md0...
Tue May  8 09:19:55 EDT 2007: Executing RAID health check for /dev/md1...
Tue May  8 09:19:56 EDT 2007: Executing RAID health check for /dev/md2...
Tue May  8 09:19:57 EDT 2007: Executing RAID health check for /dev/md3...
Tue May  8 10:09:58 EDT 2007: cat /sys/block/md0/md/mismatch_cnt
Tue May  8 10:09:58 EDT 2007: 2176
Tue May  8 10:09:58 EDT 2007: cat /sys/block/md1/md/mismatch_cnt
Tue May  8 10:09:58 EDT 2007: 0
Tue May  8 10:09:58 EDT 2007: cat /sys/block/md2/md/mismatch_cnt
Tue May  8 10:09:58 EDT 2007: 0
Tue May  8 10:09:58 EDT 2007: cat /sys/block/md3/md/mismatch_cnt
Tue May  8 10:09:58 EDT 2007: 0
Tue May  8 10:09:58 EDT 2007: The meta-device /dev/md0 has 2176 mismatched 
sectors.
Tue May  8 10:09:58 EDT 2007: Executing repair on /dev/md0
Tue May  8 10:09:59 EDT 2007: The meta-device /dev/md1 has no mismatched 
sectors.
Tue May  8 10:10:00 EDT 2007: The meta-device /dev/md2 has no mismatched 
sectors.
Tue May  8 10:10:01 EDT 2007: The meta-device /dev/md3 has no mismatched 
sectors.
Tue May  8 10:20:02 EDT 2007: All devices are clean...
Tue May  8 10:20:02 EDT 2007: cat /sys/block/md0/md/mismatch_cnt
Tue May  8 10:20:02 EDT 2007: 2176
Tue May  8 10:20:02 EDT 2007: cat /sys/block/md1/md/mismatch_cnt
Tue May  8 10:20:02 EDT 2007: 0
Tue May  8 10:20:02 EDT 2007: cat /sys/block/md2/md/mismatch_cnt
Tue May  8 10:20:02 EDT 2007: 0
Tue May  8 10:20:02 EDT 2007: cat /sys/block/md3/md/mismatch_cnt
Tue May  8 10:20:02 EDT 2007: 0