[5597] in linux-scsi channel archive
Re: Software RAID & hotplug doesn't work on Compaq (Re: Swapping on raid)
daemon@ATHENA.MIT.EDU (Gerard Roudier)
Thu Jan 14 17:01:23 1999
Date: Thu, 14 Jan 1999 20:48:12 +0100 (MET)
From: Gerard Roudier <groudier@club-internet.fr>
To: Ola Sigurdson <Ola@Sigurdson.SE>
cc: Louis Mandelstam <louism@man8.com>, linux-raid@vger.rutgers.edu,
linux-scsi@vger.rutgers.edu
In-Reply-To: <369D59B8.FB03F71@Sigurdson.SE>
On Thu, 14 Jan 1999, Ola Sigurdson wrote:
> Don't rely on software RAID on the Compaqs!!!!
>
> Unplugging active disks causes a 100 % repeatable kernel crash (total
> lockup).
> As far as I can tell it's caused by bugs in the NCR driver
>
> This is with kernel 2.0.36 & Compaq Proliant 1600.
I would suggest you the following testings:
1 - Upgrade to driver sym53c8xx-1.0a.
ftp://ftp.tux.org/roudier/896/
sym53c8xx-1.0.tar.gz (full sources to move to
linux/drivers/scsi)
+
sym53c8xx-1.0-to-1.0a.patch.gz (kernel patch)
2 - Kill everything that may prevent kernel messages from being printed
to the console if the kernel gets unable to perform disk IOs.
(killing syslogd and klogd should be enough)
3 - Run something that writes to a file-system or/and a partition
without using RAID and turn off the disk.
4 - Wait time enough for SCSI timeouts to have chance occur.
Value is 20 seconds on 2.0.35/36 kernels.
But you can decrease this value by changing SD_TIMEOUT define in
drivers/scsi/scsi.c to something like 5 seconds (5*HZ) for the
tests.
Let me know if the system locks up hard under such a creash-test (I mean
no kernel messages related to SCSI timeouts, resets and IO errors are
displayed to the console).
If it does not, perform the same testings:
5 - Using a stock driver (preferently some version > 3.1d)
6 - Using RAID.
Let me know. Thanks.
Regards,
Gerard.
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