SCSI timeout errors betwwen 2940U2W and Chaparral RAID

From: J. Maynard Gelinas (maynard@jmg.com)
Date: Tue Jan 18 2000 - 17:37:26 EST


    Hi,
    I've got an x86 host with an AHA-2940U2W running Redhat 6.1, 2.2.12, and
was wondering if anyone else out there is having trouble getting this kernel
(or 2.2.13) to talk Ultra2 to other SCSI devices. Basically what I'm getting
are timeouts during the AIC7xxx device detection phase, which resolve, and then
I get repeated ext2fs filesystem corruption problems on the disk. This machine
is connected to a Chaparral RAID array of nine 36GB disks, and is partitioned
into fourteen 20GB or so partitions. I've also tried just about every
termination setting possible on the SCSI controller BIOS, and know that the
chain is physically terminated on each end properly. So, what I'm wondering is:

   o Will a 20GB filesystem freak ext2fs out? I've never build such a large
ext2fs filesystem before, though I've never had problems with large filesystem
support on Sun UFS or SGI xfs before.

   o Is there a known problem with negotiating Ultra2 on the AHA2940U2W and
the standard AIX7xxx.c driver which ships with Redhat's 2.2.12?

   o The array has a bridge adapter sitting on LUN 1 of ID 1, but I've tried
turning off multiple LUN support for that ID as well as for the boot ID, just
to make certain that this wasn't confusing the AIX7xxx driver. Didn't help
either way, however.

Here's relevant dmesg output:

VFS: Mounted root (ext2 filesystem).
(scsi0) <Adaptec AHA-294X Ultra2 SCSI host adapter> found at PCI 18/0
(scsi0) Wide Channel, SCSI ID=7, 32/255 SCBs
(scsi0) Downloading sequencer code... 374 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.20/3.2.4
       <Adaptec AHA-294X Ultra2 SCSI host adapter>
scsi : 1 host.
(scsi0:0:0:0) Synchronous at 80.0 Mbyte/sec, offset 127.
(scsi0:0:0:-1) Unexpected busfree, LASTPHASE = 0x80, SEQADDR = 0x14f
scsi : aborting command due to timeout : pid 0, scsi0, channel 0, id 0, lun 0
Request Sense 00 00 00 10 00
SCSI host 0 abort (pid 0) timed out - resetting
SCSI bus is being reset for host 0 channel 0.
(scsi0:0:0:0) Synchronous at 80.0 Mbyte/sec, offset 127.
  Vendor: CHAPTEC Model: G5312 Rev: G2.2
  Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
SCSI device sda: hdwr sector= 512 bytes. Sectors= 571591680 [279097 MB] [279.1
GB]
 sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 sda8 sda9 sda10 sda11 sda12 sda13
sda14 sda15 >

TIA!
--Maynard

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