[4944] in linux-scsi channel archive
AIC7890: Mysterious Timeouts
daemon@ATHENA.MIT.EDU (Peter Daum)
Sun Oct 18 19:49:27 1998
Date: Sun, 18 Oct 1998 21:40:08 +0200 (MET DST)
To: linux-scsi@vger.rutgers.edu
From: "Peter Daum" <gator@cs.tu-berlin.de>
Reply-To: <gator@cs.tu-berlin.de>
Hi,
here's another pretty mysterious SCSI-problem I am expreriencing.
"/proc/scsi/scsi" reports:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: Quantum Model: XP32150W Rev: L912
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 03 Lun: 00
Vendor: HP Model: C1533A Rev: 9608
Type: Sequential-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 04 Lun: 00
Vendor: PLEXTOR Model: CD-ROM PX-20TS Rev: 1.01
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 06 Lun: 00
Vendor: YAMAHA Model: CRW4260 Rev: 1.0h
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 05 Lun: 00
Vendor: UMAX Model: Astra 1200S Rev: V1.1
Type: Scanner ANSI SCSI revision: 02
scsi0 is the onboard SCSI controller of an ASUS P2B-S motherboard
(Adaptec 7890). It has a 2GB Quantum Atlas harddisk (fast/wide)
connected to it. Currently, no LVD-devices are present. (The
whole setup is just temporary while I am waiting for a
replacement LVD disk). The disk is partitioned as follows:
Disk /dev/sda: 255 heads, 63 sectors, 274 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Begin Start End Blocks Id System
/dev/sda1 1 1 103 827316 6 DOS 16-bit >=32M
/dev/sda2 104 104 274 1373557+ 5 Extended
/dev/sda5 104 104 114 88326 82 Linux swap
/dev/sda6 115 115 153 313236 6 DOS 16-bit >=32M
/dev/sda7 154 154 274 971901 83 Linux native
Most of the time, the disk seems to work without problems (except
for the swap partition and one partition that is mounted on /tmp,
it isn't heavily used). Sequential reading (something like "dd
if=/dev/sda of=/dev/null) also works without any problems. Only
certain operations cause timeouts and scsi resets. The easiest
way to reliably reproduce these errors is to do "ls" on the 1st
DOS partition - it will take about a minute to finish, and the
syslog afterwards shows entries like this:
Oct 18 19:04:29 swamp kernel: scsi : aborting command due to timeout : pid 565,scsi0, channel 0, id 0, lun 0 Read (6) 00 02 bc 01 00
Oct 18 19:04:29 swamp kernel: scsi : aborting command due to timeout : pid 566,scsi0, channel 0, id 0, lun 0 Write (6) 1b f2 41 02 00
Oct 18 19:04:29 swamp kernel: scsi : aborting command due to timeout : pid 567,scsi0, channel 0, id 0, lun 0 Write (6) 1b f2 3d 02 00
Oct 18 19:04:31 swamp kernel: SCSI host 0 abort (pid 565) timed out - resetting
Oct 18 19:04:31 swamp kernel: SCSI bus is being reset for host 0 channel 0.
For some reason, "ls" on the other partitions works. Even on the
other partitions, recursively copying a directory causes similar
effects. The other devices on the scsi bus normally work o.k.
Only on rare occasions (for example when I try to do "ls -R" on
that DOS partition) the driver just keeps on resetting the bus
until I reboot, so the other devices become inaccessible, too.
The harddisk used to run without any problems on a NCR controller
before; furthermore, under DOS I don't have any difficulties to
access the disk. So I suppose that there is no hardware problem.
Anybody has any idea, what's going on?
Regards,
Peter
--
| Peter Daum (gator@cs.tu-berlin.de) __o (+49 30)
| http://www.cs.tu-berlin.de/~gator _'\<_ 691 46 35
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