Two thoughts here.
1) Your new tape drives accept data at a faster rate than your old tape
drives. Therfore, you might expect that DFHSM is reading the DASD at a
faster rate; hence, DFHSM gets dispatched more frequently. This would
increase the apparent CPU utilization of DFHSM. However, sin
: IBM-MAIN@bama.ua.edu
Subject: High CPU / channel ovhd w/3592 and DFDSS
Our environment is a single z9-BC mainframe (2096-R07(I01)), z/OS V1R9 @
RSU0906, a 3592-C06 tape controller w/2 FX4 channels, and 3592-E05 (TS1120)
tape drives.
We're performing initial testing towards migrating to cu
The answer used to be 'No' but that may have changed.
Thank You,
Dave O'Brien
NIH Contractor
From: Michael R. Mayne [michael.ma...@hhsys.org]
Sent: Thursday, November 19, 2009 9:30 AM
To: IBM-MAIN@bama.ua.edu
Subject: Re: High CPU / channel
This has always been a question - the DFHSM blocksize for BACKUP is
(apparently) fixed at 16K, and I know of no way to override it. Any DFHSM
experts out there?
Thanks.
-Mike
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chael R. Mayne [michael.ma...@hhsys.org]
Sent: Wednesday, November 18, 2009 7:08 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: High CPU / channel ovhd w/3592 and DFDSS
OK, I'll 'fess - the old tape subsystem is a 3490-A20 controller with 2
3490-B40 drive units. The old tape subsyst
Small blocksize maybe? Just a guess.
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OK, I'll 'fess - the old tape subsystem is a 3490-A20 controller with 2
3490-B40 drive units. The old tape subsystem has hardware compression, as
does the new. I'll check for software compression (never thought of it,
actually), but I doubt that it's turned on. If it was, I'd expect CPU (on
this
a.edu
Subject: High CPU / channel ovhd w/3592 and DFDSS
Our environment is a single z9-BC mainframe (2096-R07(I01)), z/OS V1R9 @
RSU0906, a 3592-C06 tape controller w/2 FX4 channels, and 3592-E05
(TS1120)
tape drives.
We're performing initial testing towards migrating to current tape
hardware
fr
Our environment is a single z9-BC mainframe (2096-R07(I01)), z/OS V1R9 @
RSU0906, a 3592-C06 tape controller w/2 FX4 channels, and 3592-E05 (TS1120)
tape drives.
We're performing initial testing towards migrating to current tape hardware
from (please don't ask, too embarrassed to tell). Using DFH
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