Hi,
In our environment, we have a mix of emulated 3390-9 and 3390-54. When we
have a need for small volumes (page, etc), we use 3390-9s and backfill them
with rarely referenced files - documentation, etc. I tend to keep the system
on 3390-9s (except SMPPTS!), as there was (once) a bit of a performance hit on
the emulated 3390-54s. Not sure if that's still true. The physical drives are
650GB, and with the cache in front of them, I'm not sure it matters anymore.
I'd be interested to hear opinions on this.
Thanks!
BobL
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Skip Robinson
Sent: Friday, February 22, 2013 1:40 PM
To: [email protected]
Subject: Re: Mod-9 vs. Mod-27 vs. mixed [ External ]
In the interest of frugality, I asked my storage guys some time ago to allocate
some tiny volumes for JES checkpoint and couple data sets. After a while, they
complained that it was more trouble than it was worth because we mirror most
volumes to the DR site. For every tiny source volume, they needed a
corresponding tiny mirror volume. Periodic DASD refresh (aka upgrade) projects
only added to the complexity. Pennies vs.
pounds.
.
.
JO.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
[email protected]
From: "Staller, Allan" <[email protected]>
To: [email protected],
Date: 02/22/2013 10:04 AM
Subject: Re: Mod-9 vs. Mod-27 vs. mixed
Sent by: IBM Mainframe Discussion List <[email protected]>
Space wasted for "small volumes" e.g. XCF couple datasets. Just a talking
point. With Hyper-PAV, etc. most of the other points are just "hot air".
The convenience of not having to support multiple "geometries".
<snip>
A client with DS8000 DASD configured as a mix of 3390 Mod9 and Mod27s is
considering a project to convert everything to Mod-27. Does anyone out
there have some thoughts on the advantages or disadvantages of this? I'm
not looking to start a religious discussion or other "dinotribe," so feel
free to respond to me privately. I'm just interested in perspective and
talking points, either way.
</snip>
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
This e-mail transmission may contain information that is proprietary,
privileged and/or confidential and is intended exclusively for the person(s) to
whom it is addressed. Any use, copying, retention or disclosure by any person
other than the intended recipient or the intended recipient's designees is
strictly prohibited. If you are not the intended recipient or their designee,
please notify the sender immediately by return e-mail and delete all copies.
OppenheimerFunds may, at its sole discretion, monitor, review, retain and/or
disclose the content of all email communications.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
