My Original question:
---------------------
Can somebody explain how we can enable Synchronous SCSI on a SS1 running
OS 4.0.3c. Also can you please explain if we have to change any
jumpers/settings on the Quantum 105 disk internal disk drives (that come with
the SS1) to make them Synchronous.
Please mail your responses to me, and I'll summarize.
Solution:
---------
You can enable sync SCSI on an SS1,SS1+,SLC by un-commenting the
'SCSI_OPTIONS_SYNC' line in /sys/scsi/conf/scsi_confdata.c
and building the new kernel.
To enable this in the vmunix do the following:
adb -k -w /vmunix /dev/mem
scsi_options/X ; should show 18
./W 38 ; changes only the running kernel
.?W 38 ; changes /vmunix for all of time :-)
You don't need to change any jumpers on the Quantum 105S disk to enable
sync SCSI.
More than one user recommended that, if you want to enable the sync SCSI
you should make sure that you have a SCSI cable that is "short and clean".
If you have an external drive AND one or two internals you may very well run
into problems (I'm not sure they'll be *real* problems, you may just get
occasional SCSI errors).
I myself have seen the following messages after enabling sync SCSI on my SS1+
which has an internal Quantum and an external Micropolis 327MB disk drive:
sd0: SCSI transport failed: reason 'reset': retrying command
But, without any apparent side-effects.
Acknowledgements:
-----------------
From: ekrell@@ulysses.att.com
From: lidl@@eng.umd.edu (Kurt J. Lidl)
From: Fons Ullings <fons@@nat.vu.nl>
From: jan@@eik.ii.uib.no
From: dgsi!brian (Brian Kelley/1000000)
From: sgf@@cfm.brown.edu (Sam Fulcomer)
Thanks again for all the help.
--- Bala Vasireddi, Phone: (415)962-5036 Synopsys, Inc. FAX: (415)965-8637 1098 Alta Ave DDN: bala@synopsys.com Mountain View, CA 94043 UUCP: ..!fernwood.mpk.ca.us!synopsys!bala
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