We have two identically configured system in all respects except that one
was just upgraded to 4.25E and the Fsys.aha8scsi driver running with an
Adaptec 29160 while the other is running Fsys.aha7scsi with an Adaptec
2940UW controller. Otherwise all other factors between the machines are
identical including the disk drive model numbers, file system organization
and even the content of the drives (same data, executables, etc. etc., etc)
We upgraded to the 29160 with the expectation that this higher throughput of
the controller (40mb/s with the current drives) would offer better
performance in our databases. However, we found the exact opposite to be
true. The machine runninging the aha7scsi driver with the 2940UW dumps the
entire database in just under 9 minutes while the machines running aha8scsi
with the 29160 takes anywhere from 3 to 6 minutes longer to dump the exact
Needless to say we are very disappointed. Can you offer a suggestion as to
why the supposedly double disk throughput is producing an average of 50% the
throughput? Any suggestions as to what we might do to resolve the problem?
Disk I/O is becoming an significant issue.
K. Scott Piel
Toptech Systems, Inc.