IBM Systems Magazine, Mainframe - March/April 2018 - 52

ADMINISTRATOR

enqueue named ENQUEUE1
for over six minutes. It looks
at the blockers and determines
that B2/004E2A90 on SYS2
is the top blocker. Runtime
Diagnostics then invokes
itself on SYS2 and requests
analysis of B2/004E2A90.
It discovers that it's waiting
for a latch called SYSTEST.
LATCH_TESTSET on SYS2 that's
held by B3/004FF048 on SYS2.
Runtime Diagnostics follows
B3/004FF048 on SYS2 even
if B2/004E2A90 hasn't been
waiting the minimum time. As it
analyzes B3/004FF048 on SYS2,
any events found are returned to
SYS1 for additional analysis and
correlation.

Correlated Events
Prior to z/OS 2.3, all events were
output individually. Runtime
Diagnostics now combines
related events into correlated
events to determine which action

to take. The last event found is
called the final event.
If the final event is a contention
event, the blocker might be
experiencing a problem that
Runtime Diagnostics doesn't
identify. In that case, Runtime
Diagnostic's critical message
analysis function will be
performed for the system for
which Runtime Diagnostics was
originally invoked as well as for
every system for which the final
event was a contention event.
The critical, component messages
found for the top blocker's system
in conjunction with the final event
should aid in your investigation
and resolution of the problem.
If the final event only has one
job name (e.g., a LOOP event), that
issue is probably the root of the
problem, at least of the problems
that Runtime Diagnostics
identifies, and the ACTION:
specified should be taken to
resolve the correlated events.

Figure 1: Following a Top Blocker

52 // MARCH/APRIL 2018 ibmsystemsmag.com

W

In z/OS V2.3,
Runtime
Diagnostics
not only finds
deadlocks on the
system for which
it was invoked,
but also across
systems, and
between GRS
enqueues and
latches

Figure 2 (page 53) shows
output from Runtime Diagnostics
using the example from
Figure 1 with the addition
that B3/004FF048 on SYS2
was found to be looping. The
first event found in Runtime
Diagnostic's processing, the
enqueue contention for resource
ENQUEUE1, is the first related
event and caused Runtime
Diagnostics to follow the top
blocker, B2/00432A90 on
SYS2. Notice that B2/004E2A90
on SYS2 is a waiter for the
second related event, the latch
contention event. The top blocker
B3/004FF048 on SYS2 for the
latch contention event was then
followed and discovered to be
looping, which is the final event.
Taking action for this final event
should cause the resolution of all
events in this correlated event.
Other waiters are listed for
contention events because they
might also be affected by the


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Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - March/April 2018

Table of Contents
Editor's Desk: Secure Sharing in the Cloud
Partner POV: Winds of Change: Now is the time for digital transformation on IBM Z
IT Today: Solutions and Support: 5 reasons IBM Z makes technical and financial sense for clients
Focus on Storage: New Revolution: Storage technology shifts to accommodate cloud and cognitive demands
Case Study: A Proof of Concept: ICU IT Services expands its market base by embracing Linux on IBM Z and IBM LinuxONE
Cover Story: Building on the Future: IBM Cloud Private with IBM Z helps clients reap the benefits of cloud
Feature: Securing the Cloud: New and established IBM offerings to meet enterprise data protection needs
TECH Showcase: The Clock's Ticking: IBM framework helps clients prepare for the EU's General Data Protection Regulation
Hot Topics: Go With the Flow: z/OS v2.3 Migration book is transformed to a z/OSMF workflow
Administrator: Problem Pointer: Runtime Diagnostics with z/OS V2.3 offers new ways to discover issues
Solutions: DMX Change Data Capture, Syncsort; Enterprise 3.0, Micro Focus
Stop Run: Reg Harbeck
Reference Point - Global Events, Education, Resources for Power Systems
2018 Mainframe Solutions Edition Product Index
IBM Systems Magazine, Mainframe - March/April 2018 - Intro
IBM Systems Magazine, Mainframe - March/April 2018 - Cover1
IBM Systems Magazine, Mainframe - March/April 2018 - Cover2
IBM Systems Magazine, Mainframe - March/April 2018 - 1
IBM Systems Magazine, Mainframe - March/April 2018 - Table of Contents
IBM Systems Magazine, Mainframe - March/April 2018 - 3
IBM Systems Magazine, Mainframe - March/April 2018 - Editor's Desk: Secure Sharing in the Cloud
IBM Systems Magazine, Mainframe - March/April 2018 - 5
IBM Systems Magazine, Mainframe - March/April 2018 - Partner POV: Winds of Change: Now is the time for digital transformation on IBM Z
IBM Systems Magazine, Mainframe - March/April 2018 - 7
IBM Systems Magazine, Mainframe - March/April 2018 - IT Today: Solutions and Support: 5 reasons IBM Z makes technical and financial sense for clients
IBM Systems Magazine, Mainframe - March/April 2018 - 9
IBM Systems Magazine, Mainframe - March/April 2018 - 10
IBM Systems Magazine, Mainframe - March/April 2018 - 11
IBM Systems Magazine, Mainframe - March/April 2018 - Focus on Storage: New Revolution: Storage technology shifts to accommodate cloud and cognitive demands
IBM Systems Magazine, Mainframe - March/April 2018 - 13
IBM Systems Magazine, Mainframe - March/April 2018 - 14
IBM Systems Magazine, Mainframe - March/April 2018 - 15
IBM Systems Magazine, Mainframe - March/April 2018 - Case Study: A Proof of Concept: ICU IT Services expands its market base by embracing Linux on IBM Z and IBM LinuxONE
IBM Systems Magazine, Mainframe - March/April 2018 - 17
IBM Systems Magazine, Mainframe - March/April 2018 - 18
IBM Systems Magazine, Mainframe - March/April 2018 - 19
IBM Systems Magazine, Mainframe - March/April 2018 - Cover Story: Building on the Future: IBM Cloud Private with IBM Z helps clients reap the benefits of cloud
IBM Systems Magazine, Mainframe - March/April 2018 - 21
IBM Systems Magazine, Mainframe - March/April 2018 - 22
IBM Systems Magazine, Mainframe - March/April 2018 - 23
IBM Systems Magazine, Mainframe - March/April 2018 - 24
IBM Systems Magazine, Mainframe - March/April 2018 - 25
IBM Systems Magazine, Mainframe - March/April 2018 - Feature: Securing the Cloud: New and established IBM offerings to meet enterprise data protection needs
IBM Systems Magazine, Mainframe - March/April 2018 - 27
IBM Systems Magazine, Mainframe - March/April 2018 - 28
IBM Systems Magazine, Mainframe - March/April 2018 - 29
IBM Systems Magazine, Mainframe - March/April 2018 - 30
IBM Systems Magazine, Mainframe - March/April 2018 - 31
IBM Systems Magazine, Mainframe - March/April 2018 - 32
IBM Systems Magazine, Mainframe - March/April 2018 - TECH Showcase: The Clock's Ticking: IBM framework helps clients prepare for the EU's General Data Protection Regulation
IBM Systems Magazine, Mainframe - March/April 2018 - 34
IBM Systems Magazine, Mainframe - March/April 2018 - 35
IBM Systems Magazine, Mainframe - March/April 2018 - 36
IBM Systems Magazine, Mainframe - March/April 2018 - 37
IBM Systems Magazine, Mainframe - March/April 2018 - 38
IBM Systems Magazine, Mainframe - March/April 2018 - 39
IBM Systems Magazine, Mainframe - March/April 2018 - 40
IBM Systems Magazine, Mainframe - March/April 2018 - 41
IBM Systems Magazine, Mainframe - March/April 2018 - 42
IBM Systems Magazine, Mainframe - March/April 2018 - 43
IBM Systems Magazine, Mainframe - March/April 2018 - Hot Topics: Go With the Flow: z/OS v2.3 Migration book is transformed to a z/OSMF workflow
IBM Systems Magazine, Mainframe - March/April 2018 - 45
IBM Systems Magazine, Mainframe - March/April 2018 - 46
IBM Systems Magazine, Mainframe - March/April 2018 - 47
IBM Systems Magazine, Mainframe - March/April 2018 - 48
IBM Systems Magazine, Mainframe - March/April 2018 - 49
IBM Systems Magazine, Mainframe - March/April 2018 - 50
IBM Systems Magazine, Mainframe - March/April 2018 - Administrator: Problem Pointer: Runtime Diagnostics with z/OS V2.3 offers new ways to discover issues
IBM Systems Magazine, Mainframe - March/April 2018 - 52
IBM Systems Magazine, Mainframe - March/April 2018 - 53
IBM Systems Magazine, Mainframe - March/April 2018 - 54
IBM Systems Magazine, Mainframe - March/April 2018 - Solutions: DMX Change Data Capture, Syncsort; Enterprise 3.0, Micro Focus
IBM Systems Magazine, Mainframe - March/April 2018 - Stop Run: Reg Harbeck
IBM Systems Magazine, Mainframe - March/April 2018 - Cover3
IBM Systems Magazine, Mainframe - March/April 2018 - Cover4
IBM Systems Magazine, Mainframe - March/April 2018 - Reference Point - Global Events, Education, Resources for Power Systems
IBM Systems Magazine, Mainframe - March/April 2018 - 2018 Mainframe Solutions Edition Product Index
IBM Systems Magazine, Mainframe - March/April 2018 - SE2
IBM Systems Magazine, Mainframe - March/April 2018 - SE3
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