I've Intel STL2 motherboard with Adaptec AIC-7899 SCSI controller
integrated. It works for long time without a problem with two SCSI disks:
QUANTUM ATLAS_V_18_WLS 0230 (boot device, SCSI device 0) and
SEAGATE ST336607LW 0007 (SCSI device 1).
The controller is SCSI device 7.
All devices are at the same SCSI cable that has a terminator at the tail
and 5 slots to attach devices. The controller is connected
to the slot that is most distant from terminator. The SCSI device 0
is connected to the slot that is the nearest to terminator
and SCSI device 1 to the slot that is the next.
Now I've got a pair of identical SEAGATE ST373207LW 0003, configured
them as SCSI device 2 and 3. If I attach either one to the slot nearest
to the controller then SCSI BIOS attaches a disk at 40Mbyte/s
and there are lots of read/write errors with it. If I attach disk
to the second slot from the controller, SCSI BIOS attaches disk
at 160Mbyte/s and it works just fine. It does not matter what disk
I use from the pair.
The problem is that I need to attach both disks but one of them
doesn't work (see above) - the one connected to the slot nearest
to the controller.
I've changed SCSI cable - no changes. I've updated motherboard's BIOS
using latest version available from the Intel support site, it did not help.
Pleas help. It it known problem?
8. 7899 SCSI