ADSM-L

TSM and device block sizes

2000-05-28 08:02:42
Subject: TSM and device block sizes
From: Phil Hosking <phil AT AE.IBM DOT COM>
Date: Sun, 28 May 2000 16:02:42 +0400
Hi-I have a customer running TSM V3.7 on an SP node attached to a 3494
library with B18 VTS.  In the documentation for the VTS it mentions that
you should use 256Kb block size on the SCSI channels for the virtual 3490E
drives.  It explicitly states that performance will be poor if you use
small block sizes.  Now looking at the TSM documentation I see that TSM
uses a block size of 32Kb and that it overrides what you set in AIX for the
drive itself.  Is this right?  Can I change the blocksize somewhere in TSM?

Phil

Phil Hosking       United Computer & Management Consultancy, P.O. Box 9226,
Dubai, U.A.E
     +9714 -3021502(direct)+971-50-6506941(mobile)+97143313312(fax)
phil AT ae.ibm DOT com
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