queue depth

[Xia Hao]

Hi all,

  i'm using Linux 2.0.35, no scsi patch yet.  i have one Seagate 32550W
2.1G HD and 4 Seagate 32171W all connected to a AHA2940UW adapter.  I'm
just wondering what the individual queue depths should be for each of
these disks to achieve maximum random access performance while ensuring
system stablity.  Any clues?

Axis

           SCSI Adapter: Adaptec AHA-294X Ultra SCSI host adapter
                           Ultra Wide Controller
    PCI MMAPed I/O Base: 0xfebff000
      Adaptec SCSI BIOS: Enabled
                    IRQ: 9
                   SCBs: Active 0, Max Active 5,
                         Allocated 30, HW 16, Page 255
             Interrupts: 68304
      BIOS Control Word: 0x18b6
   Adapter Control Word: 0x0073
   Extended Translation: Enabled
Disconnect Enable Flags: 0xffff
     Ultra Enable Flags: 0xffc3
 Tag Queue Enable Flags: 0x0000
Ordered Queue Tag Flags: 0x0000
Default Tag Queue Depth: 24
    Tagged Queue By Device array for aic7xxx host instance 0:
      {255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255}
    Actual queue depth per device for aic7xxx host instance 0:
      {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}


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