I was preparing to ask a very similar question, so I will.

We're not planning to upgrade the box, because we don't see significant CPU utilization,
but we have been seeing significant queue lengths via SOS (Lund).  

Our current configuration is:

959/200 (maximum memory installed)
system volume set  (model 10 array w/ 6 disks on F/W)
3 user volume sets 
  - total of 10 HASS enclosures
  - 32 2.0Gb disks (16 mirrored to 16) on 4 F/W channels
  - 48 4.3Gd disks (24 mirrored to 24) on 4 F/W channels

We intentionally stayed with smaller drives to keep the number of spindles up.
The production data is all on the 32 2Gb drives with 8 drives on each F/W channel.
The 4.3Gb drives have 12 drives per F/W channel, but those are test and backup sets.

What would others recommend to improve disk throughput? 
Should we replace the F/W with Fiber?
Should we replace the HASS units with Arrays and eliminate the mirroring?

Any other ideas?

*****************************
Terry W. Simpkins
Director - ISIT
Measurement Specialties
757-766-4278
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