Very Computer

I have 3 drives and a tapedrive on a SCSI controller and need to add a RAID
drive.  My drives can take only IDs 1,2,3,4,5,6.  My tapedrive has been ID 4
and can be switched only in 1-7 range.  Before now, I had my 3 drives
occupiing IDs 1,2,3 and tapedrive ID 4.  For reason of space availability and
length of cables, I need to put the RAID between the tapedrive and the
storage array.  So I gave it ID 6.

In this configuration, I have problemaccessing my tapedrive. I can call
"mt -f /dev/rmt/0 rewind" and see the tapdrive responding, but the operation
never completes.  In addition, my RAID array is not configured yet and
generates lots of "saf" error messages.

Is is this because I created a chain with ID order 1,2,3,6,4?

What do I do in order to change special device files for the tapedrive
to have it on a different SCSI ID?

I run Solaris 7 on Ultra 1.

Thank you. David.

--
--
David Zlotchenko
Sr. Systems Analyst            Phone: (01) (423) 974-6601

University of Tennessee        WWW: http://www.oars.utk.edu/~zlotchen

Quote:>I have 3 drives and a tapedrive on a SCSI controller and need to add a RAID
>drive.  My drives can take only IDs 1,2,3,4,5,6.  My tapedrive has been ID 4
>and can be switched only in 1-7 range.  Before now, I had my 3 drives
>occupiing IDs 1,2,3 and tapedrive ID 4.  For reason of space availability and
>length of cables, I need to put the RAID between the tapedrive and the
>storage array.  So I gave it ID 6.

>In this configuration, I have problemaccessing my tapedrive. I can call
>"mt -f /dev/rmt/0 rewind" and see the tapdrive responding, but the operation
>never completes.  In addition, my RAID array is not configured yet and
>generates lots of "saf" error messages.

>Is is this because I created a chain with ID order 1,2,3,6,4?

I suspect there might be something wrong with the bus, e.g.
termination, length, or maybe duplicate IDs.
What does probe-scsi or probe-scsi-all show from the monitor prompt?

--
Andrew Gabriel
Consultant Software Engineer

Quote:>"mt -f /dev/rmt/0 rewind" and see the tapdrive responding, but the operation
>never completes.  In addition, my RAID array is not configured yet and
>generates lots of "saf" error messages.
>Is is this because I created a chain with ID order 1,2,3,6,4?

It's most likely because you've exceeded the max cable length on the
SCSI cable (note that a any component typically counts as 1m of cable)

Casper
--
Expressed in this posting are my opinions.  They are in no way related
to opinions held by my employer, Sun Microsystems.
Statements on Sun products included here are not gospel and may
be fiction rather than truth.

Brian

in the configuration you list below, unless you are using VERY short
SCSI interconnects, youve most likely exceeded your chain lenghth. if
such is the case, you have two options: shorten the chain; insert a SCSI
repeater.

another thing you might also want to check is, your RAID array is the
same SCSI type as your other devices. likely youd be getting pretty
strong diagnostic messages if you had a differential/single-ended
mismatch somewhere in the chain, though.

-tom