IBM Systems Magazine, Mainframe - July/August 2014 - 50

TECH CORNER

Figure 1: Example GRS-Managed Latch Contention Event

relevant to the current system
problem.
Runtime Diagnostics is
not designed to be a system
monitor or part of your system
automation procedures. If you
automate calls to it hourly,
for example, some situations
may be considered abnormal
even though your system is
not experiencing problems.
These situations may be normal
behavior and you could waste
time investigating them when no
system problem is occurring.

Results of Analysis
The output of Runtime
Diagnostics is called an event,
which is a multiline write to
operator message that describes
the problem detected and the
recommended course of action.
Corrective actions are not

automatically driven because
they could be disruptive (see
Figure 1, above).
The output can be directed to
a sequential data set by editing
the HZR procedure shipped in
SYS1.PROCLIB and modifying the
HZROUT DD statement to point to
your data set.

Event Types
While z/OS V1R12 had five types
of analysis, z/OS V1R13 features
seven types of analysis. The
first type pinpoints problems in
specific components based on
occurrences of an IBM-defined
list of messages in the OPERLOG,
identified by z/OS component
experts as truly indicative of
system problems. Due to the
quantity of messages in the
OPERLOG, these are difficult to
detect because they rarely occur

Learn More
z/OS Problem Management http://bit.ly/1j0oVv4
Extending IBM z/OS System Management Functions
with IBM zAware http://bit.ly/1kyv6cB

50 // JULY/AUGUST 2014 ibmsystemsmag.com

and you'd need to know to look
for them specifically.
Runtime Diagnostics looks
back one hour in the OPERLOG
(if available) searching for
occurrences of these messages
for this system. Therefore, it is
critical that Runtime Diagnostics
is invoked shortly after system
sickness is detected so that this
search is done with the most
recent OPERLOG data. If you are
not using OPERLOG, this analysis
is skipped.
Runtime Diagnostics performs
three types of global resource
contention checking-enqueue
contention for system address
spaces, Global Resource
Serialization (GRS)-managed
latch contention and z/OS UNIX*
System Services file system latch
contention. Both types of latch
contention checking are available
starting with z/OS V1R13.
Enqueue contention checking
detects contention in a set of
address spaces defined by IBM
to be system address spaces. One
or more of these address spaces
must be waiting for an enqueue
for at least five seconds in order
for an enqueue contention event
to be created.
GRS-managed latch contention
is found when any address space
has been waiting for a latch for
more than five minutes. The name
of the address space holding the
latch and the name of the address
space that has been waiting the
longest for the latch are specified
in the event created.
Latch contention for z/OS
UNIX System Services is handled
separately from GRS-managed
latch contention. Runtime
Diagnostics creates this type
of event when a thread in any
address space is waiting for a
z/OS UNIX System Services latch
for more than five minutes.
Three types of address space
execution analysis are also


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IBM Systems Magazine, Mainframe - July/August 2014

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - July/August 2014

Table of Contents
Editor's Desk: Protecting information
IBM Perspective: Sunny outlook on the mainframe
Techbits: Watson: your personal shopper
Infographic: How the mainframe changed our world
Partner PoV: ISVs can help mainframe customers keep up with a rapidly evolving environment
Focus on Storage: IBM FlashSystem addresses storage and application performance issues
Currents: As data consumption expands, information protection policies must be put in place
Case Study: Credit Where Credit's Due: Isracard Group devises a novel way to verify its system integrity before disaster occurs
Cover Story: A Secure Fortress: The mainframe delivers the reliability, safety and cost-effectiveness your IT shop needs
Feature: Be Proactive in Risk Management: Protecting data is crucial as your business connects in ever-increasing ways along the access superhighway
Feature: Being Risk-Aware: New IBM and Ponemon study examines the economics of IT risk and reputation
Administrator: Active/Active Sites helps distribute workloads during outages
Tech Corner: A point-in-time tool, Runtime Diagnostics can find issues in a pinch
Solutions: Reflection 2014; CA Chorus; VFTP 3.0; Lifecycle Manager; STEPLIB-Rx; Ivory VisualConnect; Mainframe Abend Assist; Linux Enterprise Server Starter System for System z
Stop Run: Together, IBM executives Pat Toole Jr. and Pat Toole St. bring more than half a century of dedication to the company
Reference Point - Global Events, Education, Resources for Mainframe
2014 Mainframe Solutions Edition Product Index
IBM Systems Magazine, Mainframe - July/August 2014 - Intro
IBM Systems Magazine, Mainframe - July/August 2014 - Cover1
IBM Systems Magazine, Mainframe - July/August 2014 - Cover2
IBM Systems Magazine, Mainframe - July/August 2014 - 1
IBM Systems Magazine, Mainframe - July/August 2014 - Table of Contents
IBM Systems Magazine, Mainframe - July/August 2014 - 3
IBM Systems Magazine, Mainframe - July/August 2014 - 4
IBM Systems Magazine, Mainframe - July/August 2014 - 5
IBM Systems Magazine, Mainframe - July/August 2014 - Editor's Desk: Protecting information
IBM Systems Magazine, Mainframe - July/August 2014 - 7
IBM Systems Magazine, Mainframe - July/August 2014 - IBM Perspective: Sunny outlook on the mainframe
IBM Systems Magazine, Mainframe - July/August 2014 - 9
IBM Systems Magazine, Mainframe - July/August 2014 - Techbits: Watson: your personal shopper
IBM Systems Magazine, Mainframe - July/August 2014 - 11
IBM Systems Magazine, Mainframe - July/August 2014 - Infographic: How the mainframe changed our world
IBM Systems Magazine, Mainframe - July/August 2014 - 13
IBM Systems Magazine, Mainframe - July/August 2014 - Partner PoV: ISVs can help mainframe customers keep up with a rapidly evolving environment
IBM Systems Magazine, Mainframe - July/August 2014 - 15
IBM Systems Magazine, Mainframe - July/August 2014 - Focus on Storage: IBM FlashSystem addresses storage and application performance issues
IBM Systems Magazine, Mainframe - July/August 2014 - 17
IBM Systems Magazine, Mainframe - July/August 2014 - 18
IBM Systems Magazine, Mainframe - July/August 2014 - 19
IBM Systems Magazine, Mainframe - July/August 2014 - Currents: As data consumption expands, information protection policies must be put in place
IBM Systems Magazine, Mainframe - July/August 2014 - 21
IBM Systems Magazine, Mainframe - July/August 2014 - 22
IBM Systems Magazine, Mainframe - July/August 2014 - 23
IBM Systems Magazine, Mainframe - July/August 2014 - Case Study: Credit Where Credit's Due: Isracard Group devises a novel way to verify its system integrity before disaster occurs
IBM Systems Magazine, Mainframe - July/August 2014 - 25
IBM Systems Magazine, Mainframe - July/August 2014 - 26
IBM Systems Magazine, Mainframe - July/August 2014 - 27
IBM Systems Magazine, Mainframe - July/August 2014 - 28
IBM Systems Magazine, Mainframe - July/August 2014 - 29
IBM Systems Magazine, Mainframe - July/August 2014 - Cover Story: A Secure Fortress: The mainframe delivers the reliability, safety and cost-effectiveness your IT shop needs
IBM Systems Magazine, Mainframe - July/August 2014 - 31
IBM Systems Magazine, Mainframe - July/August 2014 - 32
IBM Systems Magazine, Mainframe - July/August 2014 - 33
IBM Systems Magazine, Mainframe - July/August 2014 - Feature: Be Proactive in Risk Management: Protecting data is crucial as your business connects in ever-increasing ways along the access superhighway
IBM Systems Magazine, Mainframe - July/August 2014 - 35
IBM Systems Magazine, Mainframe - July/August 2014 - 36
IBM Systems Magazine, Mainframe - July/August 2014 - 37
IBM Systems Magazine, Mainframe - July/August 2014 - Feature: Being Risk-Aware: New IBM and Ponemon study examines the economics of IT risk and reputation
IBM Systems Magazine, Mainframe - July/August 2014 - 39
IBM Systems Magazine, Mainframe - July/August 2014 - 40
IBM Systems Magazine, Mainframe - July/August 2014 - 41
IBM Systems Magazine, Mainframe - July/August 2014 - 42
IBM Systems Magazine, Mainframe - July/August 2014 - 43
IBM Systems Magazine, Mainframe - July/August 2014 - Administrator: Active/Active Sites helps distribute workloads during outages
IBM Systems Magazine, Mainframe - July/August 2014 - 45
IBM Systems Magazine, Mainframe - July/August 2014 - 46
IBM Systems Magazine, Mainframe - July/August 2014 - 47
IBM Systems Magazine, Mainframe - July/August 2014 - Tech Corner: A point-in-time tool, Runtime Diagnostics can find issues in a pinch
IBM Systems Magazine, Mainframe - July/August 2014 - 49
IBM Systems Magazine, Mainframe - July/August 2014 - 50
IBM Systems Magazine, Mainframe - July/August 2014 - 51
IBM Systems Magazine, Mainframe - July/August 2014 - Solutions: Reflection 2014; CA Chorus; VFTP 3.0; Lifecycle Manager; STEPLIB-Rx; Ivory VisualConnect; Mainframe Abend Assist; Linux Enterprise Server Starter System for System z
IBM Systems Magazine, Mainframe - July/August 2014 - 53
IBM Systems Magazine, Mainframe - July/August 2014 - 54
IBM Systems Magazine, Mainframe - July/August 2014 - 55
IBM Systems Magazine, Mainframe - July/August 2014 - Stop Run: Together, IBM executives Pat Toole Jr. and Pat Toole St. bring more than half a century of dedication to the company
IBM Systems Magazine, Mainframe - July/August 2014 - Cover3
IBM Systems Magazine, Mainframe - July/August 2014 - Cover4
IBM Systems Magazine, Mainframe - July/August 2014 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - July/August 2014 - 2014 Mainframe Solutions Edition Product Index
IBM Systems Magazine, Mainframe - July/August 2014 - SE2
IBM Systems Magazine, Mainframe - July/August 2014 - SE3
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