aacraid Abort timeout - Benign messages?

I've done some searching, but seem to be unable to answer this (perhaps
dumb) question: under stress (i.e. doing bonnie++ benchmarks using
unbuffered i/o) are occasional 'Abort Time-out' messages expected and/or
benign using aacraid-supported adapters?  Should I be worried?

I'm using aacraid from stock 2.4.20 kernel (as packaged by Debian
maintainers in the kernel-image-2.4.20-686-smp package) on a dual Xeon
2.0GHz box (HT on) using an Adaptec 2200S and an Adaptec (nStor made) 312R
Ultra160 disk enclosure that contains 8 73GB Seagate ST373405LC 73GB disks.
The 2200S is connected to the enclosure using a single channel and a single
cable.  Under most circumstances, this seems to be able to push up to 50-70
MB/s combined i/o from this volume using bonnie++ with the -b (unbuffered)
setting.

I get a few 'Abort timeout' messages in /var/log/messages during bonnie++
random creation and deletion tests (up to a few million small files on a
ReiserFS filesystem on an LVM volume on a PV that sits on a
controller-defined RAID 10 of 8 disks in above-mentioned enclosure).  I've
also seen this with bonnie++ rewriting tests another fs (ext3) on the same
PV as above.

Apr  1 09:09:45 homer kernel: aacraid:ID(1:00:0) Abort Time-out. Resetting
bus.
Apr  1 09:09:45 homer kernel: aacraid:SCSI bus reset issued on channel 1
Apr  1 09:24:34 homer -- MARK --
Apr  1 09:44:34 homer -- MARK --
Apr  1 10:04:34 homer -- MARK --
Apr  1 10:24:34 homer -- MARK --
Apr  1 10:40:21 homer kernel: aacraid:ID(1:00:0) Abort Time-out. Resetting
bus.
Apr  1 10:40:22 homer kernel: aacraid:SCSI bus reset issued on channel 1

The only other think worth mentioning is that there is currently a failed
disk in the enclosure that is set to offline (this volume is now running off
a hot-spare, rebuild to the spare finished this weekend, when the failure
occurred; it is at a remote location, so we have not yet had a chance to
remove the failed disk); we plan to remove this disk later this week.  Could
this be causing problems that degrade the SCSI bus in the enclosure?

Any thoughts would be appreciated.

Sean

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