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

[Justin Piszcz <jpiszcz@lucidpixels.com>]

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