On Sun, 06 Nov 2005 15:53:04 +0000, Dave <nospam@nowhere.com> wrote:

>I have a 9 GB (hence reasonably old) disk which refuses to be seen even
>at the OK prompt with a probe-scsi in a SPARC 20. One might conclude the
>disk is dead, but it seems to work fine in a Ultra 80. Both machines run
> Solaris 9, although I patched the SS20 last night, so it is more up to
>date.

The sun4m esp fast scsi controller is 8 bit only. I'm unsure whether the
upper 8 bits of the wide (16 bit) sca connector are terminated properly or
have been left open. Some wide hard disks hang unless both lower and upper 8
bits are properly terminated.

Maybe jumpering the drive to single ended may help. Jumpers for drive id or
termination have to be removed.

You may try a SunSwift fas wide scsi controller.

Mit freundlichen Grüßen

Frank-Christian Krügel