topic Re: LTO installation on RH EL3.0 in Operating System - Linux

LTO installation on RH EL3.0

Ismail DALKIRAN — Wed, 11 Aug 2004 07:31:58 GMT

Hi all
Is there a procedure for connecting an Ultrium drive to a Smart Array controller on redhat EL 3.1 ? We can see the drive on startup but not anywhere (messages, dmesg,/proc/scsi...)in Linux .

Re: LTO installation on RH EL3.0

Steven E. Protter — Wed, 11 Aug 2004 08:37:06 GMT

Few things to check:

1) Is the scsi card detected. That should show up when you boot off the array.
2) Make sure the scsi id on the back of the Ultrium drive isn' conflicting with any other devices hung off the smart array.

Problem: For best throughput you must have the Ultrium drive isolated, as in on its own scsi card. If it shares a scsi card with disk or other devices, peformance will be significantly degraded.

Also, check with HP for the appropriate driver.

SEP

Re: LTO installation on RH EL3.0

Gerrit Hannaert — Thu, 12 Aug 2004 11:15:46 GMT

I had this problem too because it seemed Linux would stop scanning LUNs (or was it SCSI IDs?) if no device was found on a certain LUN. I.e. all LUN numbers have to be filled, you can't just start at 3 or something and skip 0, 1 and 2. Be careful you don't create a conflict with the HBA though (I think it's 7 or 0 - you can see at boot time).

Besides renumbering from the bottom up, a quick-fix is to use Kurt Garloff's rescan-scsi-bus script and force scanning all LUNs. Worked for me.

http://www.garloff.de/kurt/linux/