Help tuning an Adaptec 7896.

[Doug Ledford]

Piete Brooks wrote:
> 
> Exec Summary: How can I get more than 11MB from an Adaptec 7896 ?
> 
> Gory Details:
> 
> I have 9 GigaByte GA-6BXDU motherboards which have onboard "Adaptec 7896 Dual
> Channel Ultra 2 SCSI", connected to a JBoD with 24 LVD 18GB disks, which
> appear to only manage 11MB/s,
> It looks as if the problem is that the period is set to 43 on the controller.
> 
> Using the same discs and cables on a AIC-7881U and a Adaptec 2940U2, I get
> 20MB/s and 80MB/s respectively (5 disc RAID0 manages over 60MB/s under hdparm)
> so it does seem to point at the 7896.
> 
> The Adaptec BIOS has all IDs set at 80MB/s
> 
> Any ideas what is wrong ?
> Any ideas how I can "over ride" the period of "43" ?

This means that we are interpreting the flags in the BIOS differently than the
BIOS does.  Make sure you have tried the latest aic7xxx driver (5.1.17) and if
it still does the same thing then forward me the output of the driver when the
module is loaded with aic7xxx=dump_card or booting the linux kernel with the
option aic7xxx=dump_card if you have the driver compiled into the kernel.  The
patch for 2.2 and 2.0 kernels can be found at
http://www.redhat.com/~dledford/aic7xxx.html

-- 
  Doug Ledford   <dledford at redhat.com>
   Opinions expressed are my own, but
      they should be everybody's.


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