Subject: Re: Still losing on SLC.
To: None <greywolf@defender.VAS.viewlogic.com>
From: Peter Svensson <petersv@df.lth.se>
List: port-sparc
Date: 04/30/1996 09:38:04
On Mon, 29 Apr 1996 greywolf@defender.VAS.viewlogic.com wrote:
> SLC, 16MB RAM, Sun0669 + Sun0327, CD-ROM, EXB-8200.
>
> I will try shortening the connector cables, but here is a summary of my
> problems thus far:
>
> * When accessing more than one SCSI device at a time, I get:
> esp0: RESELECT (7 bytes in FIFO!)
> This happens most frequently when I'm trying, say, to do a restore(8)
> of the filesystems from tape (it fails during LARGE files, mostly, but
> can fail anywhere). Snapshot 1.1B-960412 kernel and userland; haven't
> tried to rebuild the world from 4/23 yet. Same problem on:
> SS1+, 24MB RAM, 2xSUN0424 disks with the occasional 4mm DAT hooked
> to it.
> Is there a way to disable SCSI reselection? Right now, I'm not terribly
> interested in performance half as much as I'm interested in stability, and
> until I can locate some hints in this direction, I'm stuck running StunOS :-(.
We have the exact same thing happening on our SS1. In the end we had to
disable reselection by changing the "1" parameter to MSG_IDENTIFY() in
sys/arch/sparc/dev/esp.c:584 to a "0". Now we are at least running, but
not very fast.
Peter