Re: DASD Performance

[eric.delong@xxxxxxxxxxxxxxxxx]

     Dean,
     
     I was always under the impression that IBM DASD has been based on 
     SCSI technology for years. My recollection is that SCSI can address 
     multiple drives concurrently, though multiple drives on the same 
     controller have to share time on the bus. 
     
     Eric


______________________________ Reply Separator _________________________________
Subject: DASD Performance 
Author:  <MIDRANGE-L@midrange.com > at INET_WACO
Date:    10/1/98 3:35 PM


Hey Folks!
     
I heard a _NASTY_ rumor last week, and wanted to confirm it here.  While we've 
had our tuning differences here in the past (I prefer manual tuning, others 
prefer QPFRADJ set on), one thing we've always agreed upon is that the number 
of disc arms is important.  Now I hear that arms are irrelevant on the new 
SCSI-based boxes, because the SCSI architecture will only access one drive at 
a time.  Is this true?  If so, how does one tune hardware under this new 
paradigm?  All the books still talk about arms!!!
     
TIA,
     
Dean Asmussen
Enterprise Systems Consulting, Inc.
Fuquay-Varina, NC  USA
E-Mail:  DAsmussen@aol.com
     
"The two hardest things to deal with in life are failure and success." -- 
Unknown
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