Kevin,
> That does seem low. What rate do you get with software RAID (of the
> same type, of course) to the same disks (might have to be through a
> standard SCSI controller to be meaningful) with roughly the same
> disks/channel distribution?
Unfortunately, I can't do this without blowing away all of my current
software setup. I noticed the performance problem *after* installing
Linux, PostgreSQL, Apache, PHP, pam_auth, NIS, and my database ....
and, of course, customized builds of the above.
> The Adaptec 2200S has a 100MHz CPU. That's pretty weak. The typical
> modern desktop system has a factor of 20 more CPU power than that. A
> software RAID setup would have no trouble blowing the 2200S out of
> the
> water, especially if the OS is able to make use of features such as
> tagged queueing.
>
> Since the 2200S has a JBOD mode, you might consider testing a
> software
> RAID setup across that, just to see how much of a difference doing
> the
> RAID calculations on the host system makes.
This isn't something I can do without blowing away my current software
setup, hey?
-Josh