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SCSI Disk Request Scheduling

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Yun Li

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Mar 10, 1998, 3:00:00 AM3/10/98
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Hi, all,

Modern SCSI disk drives may implement their own disk scheduling algorithms.
How can we disable disk scheduling or enfore the FIFO disk scheduling
on disk drive? The operating system we used is Windows NT with DDK and
the disk is Seagate ST32550W.

Thanks for your help.
Yun

Ron Reaugh

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Mar 11, 1998, 3:00:00 AM3/11/98
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Yun Li <yl...@syr.edu> wrote in article <6e3pv6$8...@newstand.syr.edu>...


The Mode Page settings onboard a SCSI HD may offer some options here.
You'll need a mode page editor and the full SCSI spec for the ST32550W from
Seagate. Why are you trying to enforce FIFO ordering for disk I/O
requests?


Chris Pitzel

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Mar 13, 1998, 3:00:00 AM3/13/98
to Yun Li

I would recommend that you order the appropriate Barracuda 2LP manuals
from Seagate if you are needing to perform this tweaking. I believe
they'll send them to you for free or for a very low cost (the ones I
have here were free).

The Seagate manuals (not just the installation guide) are very useful
references, and are good reading for those interested in all the things
that one can set in a modern SCSI hard drive like the Barracuda.

Yun Li wrote:
>
> Hi, all,
>
> Modern SCSI disk drives may implement their own disk scheduling algorithms.
> How can we disable disk scheduling or enfore the FIFO disk scheduling
> on disk drive? The operating system we used is Windows NT with DDK and
> the disk is Seagate ST32550W.
>

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