At 4:04 PM +0100 2000/2/24, Brad Knowles wrote:
> Now that the problem has been fixed, initial preliminary test
> results indicate that I do actually see almost 2x speedup using
> two host SCSI controllers to the two different drive array
> controllers. I'm now moving one of the host SCSI adaptors back
> to the other PCI bus, to see if that helps, hurts, or makes no
> difference to the performance.
>
> If it doesn't hurt, I plan on leaving them on separate PCI busses.
Blargh. It does appear to hurt. I'm trying the two 2940U2W
controllers on the primary PCI bus with the on-board AIC-7890
controller hard-wired to the secondary PCI bus. If that doesn't work
(and I don't suspect it will, but I want to test it for the sake of
completeness), then for this machine the only solution appears to be
to put SCSI controllers on the secondary PCI bus and everything else
on the primary PCI bus.
If that's the case, I'm going to be quite annoyed. That will
mean that I cannot expand the number of SCSI busses in this machine
by just adding more controllers. Instead, I will be forced to
increase the number of SCSI channels by swapping out the current
controllers and using 3950U2W controllers instead.
Blargh. Double blargh. Blargh, say I.
BTW, is anybody at all actually interested in this stuff, or am I
just talking to myself?
--
These are my opinions and should not be taken as official Skynet policy
_________________________________________________________________________
|o| Brad Knowles, <[EMAIL PROTECTED]> Belgacom Skynet NV/SA |o|
|o| Systems Architect, Mail/News/FTP/Proxy Admin Rue Col. Bourg, 124 |o|
|o| Phone/Fax: +32-2-706.13.11/726.93.11 B-1140 Brussels |o|
|o| http://www.skynet.be Belgium |o|
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