From: Tejun Heo <tj@kernel.org>
To: "Török Edwin" <edwintorok@gmail.com>
Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com>,
linux-ide@vger.kernel.org, jgarzik@pobox.com
Subject: Re: Problems with ALPM on devices part of raid array
Date: Sat, 30 Aug 2008 12:53:34 +0200 [thread overview]
Message-ID: <48B926AE.7030108@kernel.org> (raw)
In-Reply-To: <48B17C20.7020203@gmail.com>
Török Edwin wrote:
> I have an AHCI capable chipset now (ICH10), so I tried ALPM[*], by
> echo-ing min_power to:
> ./class/scsi_host/host0/link_power_management_policy
> ./class/scsi_host/host5/link_power_management_policy
>
> The 6 SATA2 drives have 3 partitions each, partition 1 is RAID1,
> partition 3 is RAID10.
>
> This soon caused me troubles, as the kernel gave I/O error messages, and
> unmounted my filesystems running
> on /dev/md4 (raid10 array). Unfortunately I don't have those messages
> saved to my logs, because my /var filesystem got automatically unmounted.
> I had no choice but to reboot, and then md kicked 4 drives out of the
> md4 array (6 total drives), and then refused
> to assemble (too few drives). The RAID1 array (md3) got reassembled, and
> resynced successfully.
> I had to force the assembly of /dev/md4 [and encountered a mdadm bug
> while doing so: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496334]
>
> I think ALPM should refuse to set link pm if the device is part of a
> raid array, or the md driver should be aware
> of ALPM, and wait a little longer for the device to come back online.
> Mentioning this problem somewhere in the sources/docs would be nice.
Being part of RAID is very unlikely to have anything to do with the
failures. Can you post kernel, boot log, error messages and the
output of hdparm -I on array members?
--
tejun
next prev parent reply other threads:[~2008-08-30 10:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-24 15:20 Problems with ALPM on devices part of raid array Török Edwin
2008-08-30 10:53 ` Tejun Heo [this message]
2008-08-30 14:33 ` Török Edwin
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