Although the Model-20 Array was installed and every thing 
works, we took a performance hit.  

Symptoms were:

ODBC users were eating up all the CPU time, causing other
software, (such as Fantasia) to get CPU starved.

Found out something to avoid:

Don't put your Model 20 on a fully loaded expansion bay.
(Ours had 6 of 7 slots filled.)

A FWSCSI card in the expansion bay was chosen because I 
ended up fishing for an FWSCSCI card with a good firmware 
Rev.

Although the expansion bay is an extension of the backplane,
we found out (by rumor and innuendo) that it is slightly
throttled.  Even more so when you have 4 Jamaica boxes and 
2 DLTs already there.  The Model-20 was the 6th device.

So the fix was, I took the FWSCSI card out of the 
expansion bay and swapped it with a FWSCSI card in 
the original chassis.  (Which is also a already fully 
loaded 959KS.)

Of course beforehand:  

I went into SYSGEN and swapped the paths between the
devices on the two cards.

When rebooting:

I changed the Primary Boot path to the new location 
(PA PRI or PRIMPATH, depending on your model.)

Performance is much better now.

So if you have a choice between a fully loaded expansion
bay and a fully loaded CPU chassis, choose the original
chassis when adding a Model-20.

BT


Tracy Johnson
MSI Schaevitz Sensors 
 

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