Two quick questions, TK70 & DSSI

From: Paul Thompson <thompson_at_athenet.net>
Date: Thu May 6 20:29:41 1999

On Thu, 6 May 1999, Chuck McManis wrote:

> 2) What termination requirements are there on DSSI disks? I powered up the
> two RF71's and the KQSFA DSSI controller in the BA213, they spun up and the
> ready lights were on but when UNIX probed the controller it saw only one
> drive and when I tried to read that drive its FAULT light started flashing.
> The cabinet is set up to connect the card to a ribbon cable that connects
> both drives and then ends at a funky high density connector (looks a lot
> like SCSI-2).

If you're running Unix, you probably will want to check the ALLOCLASS and
UNITID portions of the failing unit in the DSSI PARAMS configuration via
SET HOST /DUP/DSSI [node#] from your >>> prompt.

My experience on a mips DEC5400 suggests that unix (in my case, Ultrix)
does not like a non-zero allocation class and it likes the UNITID of the
drive to match that of the plug. Also keep in mind that you'll have to
add some entries similar to this into your kernel for it to recognize new
drives or previously unused controllers:

controller dssc1 at msi0 msinode 1
controller dssc2 at msi0 msinode 2
disk ra1 at dssc1 drive 1
disk ra2 at dssc2 drive 2

You didn't mention if your unix was Vax ultrix or a bsd port, so your
specifics may vary.

Paul
Received on Thu May 06 1999 - 20:29:41 BST