linux-kernel - Re: MD/RAID time out writing superblock

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Message-ID: <20090907115927.GU8710@arachsys.com>
Date:	Mon, 7 Sep 2009 12:59:27 +0100
From:	Chris Webb <chris@...chsys.com>
To:	linux-scsi@...r.kernel.org
Cc:	Tejun Heo <tj@...nel.org>, Ric Wheeler <rwheeler@...hat.com>,
	Andrei Tanas <andrei@...as.ca>, NeilBrown <neilb@...e.de>,
	linux-kernel@...r.kernel.org,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Jeff Garzik <jgarzik@...hat.com>, Mark Lord <mlord@...ox.com>
Subject: Re: MD/RAID time out writing superblock

Chris Webb <chris@...chsys.com> writes:

> I have a bitmap on the array, but sometimes when I remove and re-add a
> failed component, it doesn't seem to use the bitmap and does a lengthy full
> recovery instead. One example that's ongoing at the moment:-
> 
>       [=>...................]  recovery =  5.7% (40219648/703205312) finish=7546.3min speed=1463K/sec
>       bitmap: 34/126 pages [136KB], 8192KB chunk
> 
> which is rather painful and has to be throttled back with speed_limit_max to
> avoid the virtual machines running on top of it from having extremely poor IO
> latency.

I've also noticed that during this recovery, I'm seeing lots of timeouts but
they don't seem to interrupt the resync:

  05:47:39 ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
  05:47:39 ata5.00: cmd ec/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in
  05:47:39         res 40/00:00:00:4f:c2/00:00:00:00:00/40 Emask 0x4 (timeout)
  05:47:39 ata5.00: status: { DRDY }
  05:47:39 ata5: hard resetting link
  05:47:49 ata5: softreset failed (device not ready)
  05:47:49 ata5: hard resetting link
  05:47:49 ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
  05:47:49 ata5.00: configured for UDMA/133
  05:47:49 ata5: EH complete
  
  08:17:39 ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
  08:17:39 ata5.00: cmd ec/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in
  08:17:39         res 40/00:00:35:83:f8/00:00:4d:00:00/40 Emask 0x4 (timeout)
  08:17:39 ata5.00: status: { DRDY }
  08:17:39 ata5: hard resetting link
  08:17:49 ata5: softreset failed (device not ready)
  08:17:49 ata5: hard resetting link
  08:17:49 ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
  08:17:49 ata5.00: configured for UDMA/133
  08:17:49 ata5: EH complete
  
  10:22:39 ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
  10:22:39 ata5.00: cmd ec/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in
  10:22:39         res 40/00:00:00:4f:c2/00:00:00:00:00/40 Emask 0x4 (timeout)
  10:22:39 ata5.00: status: { DRDY }
  10:22:39 ata5: hard resetting link
  10:22:49 ata5: softreset failed (device not ready)
  10:22:49 ata5: hard resetting link
  10:22:50 ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
  10:22:51 ata5.00: configured for UDMA/133
  10:22:51 ata5: EH complete

Cheers,

Chris.
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