Subject: RE: FLASHCOPY performance to a DS6800 DASD
From: Edward M. Martin (EMartin@aultman.com)
Date: Wed Jul 16 2008 - 10:34:12 EDT
Hello Eric,
I don't have the historical data I would like,
BUT
TMON CICS/TS monitor shows that our highest AVG RESPONSE has dropped
from .2 to .021 seconds.
TMON would show RED for any .2 or higher. All file
responses have dropped to under .021.
MOST are .003 or lower.
We are z/VM 5.3 with three VSE/ESA 2.6.x systems. z/VSE 411 is being
installed. And we do have CA-WEBGATEWAY
With z/VM UltraQuest using Nomad2 on the z/VM side running.
I have MDC turned off for the system.
CPU is not pegged unless all four WORKER machines are running on the
UltraQuest system. Normal CPU is 50-60%,
With peaks throughout the day.
The z890 HWC monitor shows that the 4 FICON do not go over 8% while the
6 ESCON would be driven to 30%.
And the 3490E cartridge with 2 ESCON would be driven to 70-80%.
Most of the time the 4 (1 gig) FICON are at 5% or lower.
I intend to knock of another 2 hours from the batch cycle and eliminate
a lot of cartridges.
Ed Martin
330-588-4723
ext 40441
From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf
Of Eric Schadow
Sent: Wednesday, July 16, 2008 10:18 AM
To: VSE Discussion List
Subject: RE: FLASHCOPY performance to a DS6800 DASD
Ed
The flash doesn't actually copy the data that quick. It just starts to
copy the data then says ok it's complete as the copy is done on the
background. If a track of data on the source volume is changed before it
is copied the target then the 6800 keeps track of it automagically.
ESCON to FICON gained you most of the performance gain.
Do you have any I/O stats?
Are you z/vm?
Do you run MDC?
Is CPU pegged during the batch?
-----Original Message-----
From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU]On Behalf Of
Edward M. Martin
Sent: Wednesday, July 16, 2008 10:00 AM
To: VSE Discussion List
Subject: FLASHCOPY performance to a DS6800 DASD
Hello Everyone,
I need some confirmation. I am just amazed at the performance of
the DS6800
I just did the z/VM command FLASHCOPY on a 3390-mod 9 on DS6800 to
another 3390-mod 9 volume on the DS6800.
FLASHCOPY 8A2 0 END TO 8A1 0 END SYNCHRONOUS
The command responded instantaneously.
SYNChronous
tells CP to process the command immediately and does
not allow you to
enter any other commands until the hardware has
accepted all parameters,
all messages from the Enterprise Storage Server
(ESS) subsystem have been
processed, and the FLASHCOPY command completes.
Is the DS6800 and the FLASHCOPY really that fast or is
there something going on behind the
scenes?
Performance has been pretty unbelievable but the
FLASHCOPY was just too fast.
Example Our Batch cycle at night use to take 5-5.5
hours. Started at midnight and
Completeed around 5:30 am.
Old system EMC SYMETRIC 8 gig of cache and 6 ESCON
connections.
SWITCH to DS6800.
DS6800 2 gig of cache with 4 FICON connections.
Batch cycle dropped by 1 hour without any other changes.
Start at midnight and completes
around 4-4:30 am.
Ed Martin
330-588-4723
ext 40441
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