IBM DFHS S2W drive problem (scb related?)

[Leonard N. Zubkoff]

  Date: Mon, 9 Feb 1998 07:18:02 -0500 (EST)
  From: "Steven N. Hirsch" <shirsch at ibm.net>

  My sympathies!  This drove me crazy with my DFHS S4W until a user in
  Germany pointed out that IBM drives are shipped with the Dque bit set in
  the configuration page.  So, the drive reports that it is capable of
  tagged command queueing in the mode sense, but fails miserably when the
  controller actually tries to use it...

  I suggest rebuilding the aic7xxx driver with tagged queueing disabled.
  This will let the machine boot.  Once you have it up and running, use a
  utility like scsi-config (available on sunsite, I believe) to clear the
  Dque bit and save the page to the drive.

  Then, reenable tagged queueing, reboot, and enjoy.

I suspect there may be a particular source of these drives that have the DQue
bit set.  None of the DFHS units I've used have ever exhibited this problem, so 
it could well depend on the OEM for whom IBM built them.  In fact, no drive
I've ever purchased has had the DQue bit set.

		Leonard

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