Tuning 2940

From: Mark Dabrowski <mark@dont-contact.us>
Date: Tue, 26 May 1998 21:06:27 -0400

The only thing I can change in kernel is enable ultra wide (which for some
reason shows only 20MB/s). This is what I added to my kernel config file:

aic0 at pci? flags 0x00001000
aic1 at pci? flags 0x00001000
aic2 at pci? flags 0x00001000

When the system boots this is what I get:

May 26 22:40:00 volcano kernel: tg0 at aic0 target 2: with disconnect, no
tag queueing, wide, synchronous @ 20.0MB/s
May 26 22:40:00 volcano kernel: sd0 at tg0 unit 0: disk: SEAGATE ST423451W
rev 0013 (SCSI-2) 45322644*512

I think I know how to enable tag queueing... What does it do anyways?

Is there other way of configuring 2940 other than through kernel?


At 13:56 5/26/98 -0500, you wrote:

>> Correct me if I'm wrong, but that means our SCSI controller (Adaptec 2940
>> Ultra) / disk is maxing out at 100 operations / second...

>Are you running ultra drives? is ultra enabled? How many Commands are you
>sending to the controller simultaneously? You can genereally tweak the
>2940 quite a bit, enable tag queueing, paging, ultra, etc.

+ Mark Dabrowski @ Canada On-Line @ Toronto, Ontario
+ Tel: (905) 624-8566 ext.5067, Fax: (905) 624-5397, mark@ica.net
+ For technical inquires please email support@ica.net or call our
+ Technical Support Department at (905) 624-1953.
Received on Tue May 26 1998 - 18:08:43 MDT

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