We have an IBM F50 (AIX) with a two drive scalar tape library. We have a
SCSI card for each drive and a separate SCSI card for the Robot.  We saw
enhance performance when each drive had its own controller and seperated
the Robot as per a suggestion from Scalar (This was to eliminate problems
with commands being sent to the robot while a tape was busy.)

We also have a seperate DAT drive that is used for database backups. No
sense in wasting a DLT tape.

This system works well for us.



 (Embedded
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Please respond to ADSM-L AT vm.marist DOT edu

To:   ADSM-L AT vm.marist DOT edu
cc:    (bcc: Roger Nadler)
Subject:  How many drives per SCSI card?




We are about to add another ADSM server on a HPUX 10.2 system. Today we
have 3 production ADSM servers on MVS.  We plan on using the STK 9710
tape library. Quantum DLT7000 drives.  We were wondering where the
dropoff in performance is for how many drives you connect per SCSI card?
If anyone could share their experiences I would appreciate it very much
TIA

Becky Buechler
Kimberly Clark Corporation
email: buechler AT kcc DOT com