Cheryl Watson's z/OS 101 Primer
A compilation of z/OS articles for those new to the mainframe or new
to performance. Originally published in Cheryl
Watson's Tuning Letter, these articles are part of series addressing
performance, capacity planning, data center reporting, and charge back
areas. Check back regularly to download the most recent compilation as
installments will be added every few months.
101 Primer 2009
101 Primer 2010
101 Primer 2011
101 Primer 2012
This article was published in our Tuning Letter 2008 No. 6, and describes
how to report SMF subtypes. In our ongoing Tuning Letter series on SMF
records, we have been trying to accumulate statistics by SMF subtype, in
addition to SMF types. A program to use MXG for that analysis is
available at our Free
Tools page. If you are willing to send us information about the
SMF subtypes that you collect, we would certainly appreciate it.
This article originally appeared in Tuning Letter 2007 Issue No. 2.
Portions of the article were also included in Cheryl's
Hot Flashes #17, which was presented at the SHARE user conference in
Tampa where it won a Best Session Award.
for Goal Mode
This article on Positioning For MVS SP 5 was written for our September/October
1994 Tuning Letter. The section of the article on preparing for Workload
Manager is as useful today as it was then for sites who are preparing to
move to WLM goal mode. The suggestions will help you prepare your IPS and
ICS for an easy migration. If you plan to use IBM's Goal Mode Migration
Aid (GMMA) from their Web site http://www.s390.ibm.com/wlm,
then also read the GMMA documentation before modifying the comments of
This 12 page article, from the 1999 No. 4 issue of Cheryl Watson's
Tuning Letter, shows why we believe performance tuning can save you huge
amounts of money, even in the face of ever cheaper hardware. We give real
life examples, and show how to cost justify your tuning projects for management.
Why Go to Goal
It takes only hours - at most a few days - to start a test system running
in goal mode, and the benefits can be enormous. Here's an article (in PDF
format) to help justify to management (and yourself) the effort of migration.
This article was previously published in our 1999, No. 5 issue.
Getting to Goal
Mode - Step by Step
This is a simple checklist of how to get to a monoplex environment
and run in goal mode.
Why Your CPU Capacity
May Not Match Your Vendor's Estimate
IBM publishes their Large Systems Performance Reference
(LSPR) ratings, and Amdahl and HDS publish their relative performance ratings
for new processor speeds and capacity. Do these ratings match your workloads
and will your work experience the performance differences as published
by the vendors? This paper provides an explanation of why (and why not)
your performance may match the vendor's performance results.
Another article you might find interesting is called
"Processor Upgrades" and was the focus of our 1998, No. 6 issue. It deals
with the problems encountered when you move to fewer, but faster, CPs.
The entire issue (1998,
No. 6) is downloadable.
SMF Reference Summary
This handy SMF Reference Summary was last updated in January of 2006
and includes information up through z/OS 1.7. It includes a listing of
SMF record types and subtypes, a listing of the SMF exits, and other useful
information related to the management of this important resource.
For many other articles, please don't miss our sample
Tuning Letter issues. We continue to post some of these older issues,
not only to show the scope of a typical Tuning Letter, but because the
information is still current and because we receive frequent requests regarding
their topics. A good example is the 2004 issue on z990 performance.