Workload Management Update for z/OS 1.10 and 1.11

© 2010 IBM Corporation
Workload Management Update for
z/OS 1.10 and 1.11
Thomas Blattmann
z/OS Workload Management Development, Boeblingen, Germany
blattmann@de.ibm.com

2
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Notes:
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3
Agenda
 Enclave Enhancements
– Enclave Server Management
– Work-Dependent Enclaves
 WLM Management
– LDAP Support
– Resource Group Enhancements
– Do not always honor Skip Clock in Policy Adjustment
 WLM Reporting
– Extend Number of Report Classes
– Additional Group Capacity Information in RMF
 Externalized OPT Information
 Enhanced Storage Monitoring
 WLM Tools Overview

4
WLM Enclaves – An Overview
 An enclave is a transaction that can span multiple dispatchable units (SRBs and
tasks) in one or several address spaces and is reported on and managed as one
unit.
 The enclave is managed separately from the address spaces it runs in.
– CPU and I/O resources associated with processing the transaction represented by the
enclave are managed by the transaction’s performance goal.
– Storage (MPL level, paging) of the address space is managed to meet the goals of the
enclaves it serves (if enclave server address space) or to the performance goal of the
address space (if no server address space).

5
WLM Enclave Server Address Spaces
A Short Retrospective
 An address space becomes an enclave
server when
– An enclave SRB issues SYSEVENT
ENCASSOC
– A TCB of the address space joins an enclave,
and does not specify ENCLAVESERVER=NO
(which is typically not the case)
 Assumption (Programming Model)
– All work being executed within the address
space is related to enclaves
– That means
• There is no significant amount of work (TCBs)
executing in such address spaces which is not
related to enclaves
 Enclave Server Management
– CPU and I/O DP is derived from service class
of most important enclave
• Meaning: No CPU and I/O management exists for
these server address spaces
– Storage management is done to meet the
served enclave‘s goals.

6
WLM Enclave Server Management
Is There a Possible Problem?
 What if the programming model does not hold true?
– What happens if there is significant work running in
TCBs not associated with enclaves?
• Example: Garbage collection for a JVM (WAS)
• Example: Common routines which provide service for the
enclave TCBs
– Is it sufficient to manage this work in the same way as
the enclaves?
 What happens if no enclaves are running in server
address spaces ?? (this applies to queue servers only)
– And the address space is swapped out?
• A mechanism exists to swap in the address space but this
mechanism assumes that the swap in is only for a queue
server task which wants to select a unit of work and then
joins the enclave. If no enclave is joined, the address space
is again swapped out.
– And even if the address space stays swapped in?
• The TCBs running within the address space just stay with
the DP and IOP from the last enclave being associated with
the address space.
• No CPU or I/O adjustment is perfomed.

7
WLM Enclave Server Management
Changes with z/OS 1.12
 New OPT Parameter
– ManageNonEnclaveWork = {No|Yes}
• Default: No (no change to previous releases)
– Causes everything in the address space,
which is not associated to an enclave, to be
managed towards the goals of the external
Service Class to which the address space has
been classified to.
 Advantages
– Enclave (Queue) server address spaces in
which no enclave is running will be managed
as usual address spaces.
– The importance and goal of the service class
for the address space now has a meaning.
 Attention
– The importance and goal of the service class
for the address space now has a meaning
• Therefore verify goal settings for server address
spaces
• This is a deviation from the past when the
service class for servers was only important for
startup, shutdown and recovers

8
Work-Dependent Enclaves
 Background
zIIPs allow middleware components to run a certain percentage of their work “offloaded”
from regular processors.
The offload percentage is an attribute of the enclave under which the unit of work runs.
The offload percentage is defined by the middleware component via a (not generally
published) WLM interface.
 Limitations
It is not possible to specify different offload percentages for different units of work
running under the same enclave.
 Intended Use Case
DB2/DDF wants to specify different offload percentages for the different units of work of
a parallel query,
AND still wants to maintain the transactional context to run the units of work under the
same “SRM Transaction” (enclave).

9
DB2
Address Space
Independent Enclave
zIIP Offload = X %
Work-Dependent Enclave
zIIP Offload = Y %
Work-Dependent Enclave
zIIP Offload = Z %
create
create
Managed as one transaction, represented by Independent Enclave
 Solution
Implement a new type of enclave named “Work-Dependent” as an extension of an
Independent Enclave. A Work-Dependent enclave becomes part of the Independent
Enclave’s transaction but allows to have its own set of attributes (including zIIP offload
percentage).

10
SDSF Enclave Panel

11
RMF Monitor III

12
Enclave Enhancements: Availability
Function z/OS V1.12 z/OS V1.11 z/OS V1.10 Older
Releases
Non Shell Server Management
+
Work-dependent Enclaves
+ + OA26104
OA26104
 z/OS 1.8
 Non Shell Server Management
New OPT Parameter ManageNonEnclaveWork=YES/NO. Default is NO, meaning the function is not
yet enabled.
 Work-Dependent Enclaves
– New function available with WLM APAR OA26104
– DB2 exploitation with APAR PK76676
– SDSF support with APAR PK74125
– RMF support with z/OS 1.11

13
WLM Management: LDAP Subsystem is supported
 Work requests include all work processed by the z/OS
LDAP server.
 Supported Work Qualifiers
– Subsystem Instance (SI)
The z/OS LDAP server‘s job name. Needed to distinguish
between different LDAP servers.
– Transaction Name/Job Name (TN)
The z/OS LDAP server‘s enclave transaction name. “GENERAL“
for all LDAP work that is not assigned a user-defined exception
class. Any transaction name that is also defined in the
configuration file of the directory server.
 For further information see
z/OS IBM Tivoli Directory Server Administration and Use for
z/OS (SC23-5191-XX )

14
WLM Management:
Subsystems supported by the WLM Administrative Application
Not relevant anymore Latest supported subsystems

15
WLM Management: Resource Group Type 1
Limitations
 Type 1 Resource Groups provide sysplex-wide limits for CPU consumption.
 Prior to OA29704 (for z/OS 1.10 and 1.11) a minimum and maximum of 999,999
SUs/sec was the highest possible definition.

16
WLM Management: Resource Group Enhancements
 OA29704 for z/OS 1.10 and z/OS 1.11 allows you to specify new limits of up to 8 digits.
 Because this is a PTF (APAR) a warning message is shown when a min/max capacity value
greater than 6 digits is entered.
Make sure that all systems are at least at z/OS 1.10 with OA29704 applied before installing and
activating such a service definition
• On systems w/o this support the WLM Administrative Application is not able to extract the service definition from
the Couple Data Set.
• On systems w/o this support the WLM Administrative Application would truncate the resource group capacity
values to 6 digits if it is attempted to read the Service Definition from ISPF tables.
Regardless of whether or not the APAR has been applied, systems w/o the support honor the
definition during runtime.

17
WLM Management: Do Not Always Honor Skip Clock
 What is the skip clock ?
– If WLM can‘t help a service class it sets a skip clock to not assess it in the
next 3 policy adjustment cycles.
– This is done for efficiency reasons and to help other work.
 Is this always a good thing to do ?
– Usually yes !!
As long as many service classes (10 or more) have been defined it is usually the case
that more than 1 service class miss its goals
– But
• In the rare case that only a few service classes are defined in a service definition then
also only 1 or 2 can miss their goals.
• In this event it is not beneficial to no longer assess a service class for 3 consecutive
policy adjustment cycles
 Especially when it might be possible to help the work with IRD Weight Changes
 In this event the situation on another LPAR can change and might make it possible to help a
service class in the next policy adjustment cycle
 Solution introduced with z/OS 1.11
The skip clock will no longer be honored if 5 or less service class periods do
not meet their performance objectives.

18
WLM Management
Availability

19
Group Capacity: Summary
 Is based on defined capacity
– Each partition obtains information for the other partitions of the group from PR/SM
– Calculates the group consumption and whether the group should be capped
– If the group becomes subject to capping
– The partition calculates whether it is above or below of its entitlement
– If it is above its entitlement the partition must apply capping (phantom weight or cap pattern)
 The entitlement of a partition is its share based on its weight within the group (named target
MSU)
– In addition if not all partitions use their entitlement the partition can obtain unused MSUs
– The partition can always use its target MSU value assuming the overall LPAR definitions allow it
 Group Capacity and Defined Capacity can be combined
– The z/OS system will always honor the smaller of both capacity limits
 It is possible to define multiple capacity groups on a CEC
– A partition can only belong to one group
 Working with IRD CPU Weight Management
– Defined and Group Capacity work with IRD but
• Weight Changes are only possible for partitions which are not being capped (or subject to capping)
 Restrictions: Defined and Group Capacity
– A partition must not be defined with dedicated processors
– The partition must be defined with shared processors and WAIT Completion = NO
– Initial Capping must not be defined
– z/OS must not run as a VM guest
 PR/SM capping works within ±3.6% from the defined capping value

20
Group Capacity: Demo Scenario
Actual MSU values
0
20
40
60
80
100
120
140
19:03
(45)
19:23
(49)
19:43
(53)
20:03
(57)
20:23
(61)
20:43
(65)
21:03
(69)
21:23
(73)
21:43
(77)
22:03
(81)
22:23
(85)
22:43
(89)
23:03
(93)
23:23
(97)
23:43
(101)
00:03
(105)
00:23
(109)
00:43
(113)
01:03
(117)
01:23
(121)
01:43
(125)
02:03
(129)
02:23
(133)
02:43
(137)
03:03
(141)
03:23
(145)
03:43
(149)
04:03
(153)
04:23
(157)
04:43
(161)
05:03
(165)
05:23
(169)
05:43
(173)
06:03
(177)
06:23
(181)
06:43
(185)
07:03
(189)
07:23
(193)
07:43
(197)
08:03
(201)
08:23
(205)
08:43
(209)
09:03
(213)
09:23
(217)
09:43
(221)
10:03
(225)
10:23
(229)
IRD4 IRD3 IRD5
IRD5 gets
24-25 MSU
IRD3 gets
7.6-9 MSU
IRD4 gets 16.5-
18.3 MSU
High demand all partitions CPU demand only on IRD3 and IRD4
IRD5 uses less than 3 MSU
and donates 22 MSU
IRD3 gets 16-19 MSU
(additional 8 MSU)
IRD4 gets 30-32 MSU
(additional 14 MSU)

21
Capacity Group Example
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
00:20:03
01:10:03
02:00:03
02:50:04
03:40:04
04:30:04
05:20:04
06:10:04
07:00:04
07:50:04
08:40:04
09:30:04
10:20:04
11:10:04
12:00:04
12:50:04
13:40:04
14:30:04
15:20:04
16:10:04
17:00:04
17:50:04
18:40:04
19:30:04
20:20:04
21:10:04
22:00:04
22:50:04
23:40:04
00:30:04
01:20:04
02:10:04
03:00:04
03:50:04
04:40:04
05:30:04
06:20:04
07:10:04
08:00:04
08:50:04
09:40:04
10:30:04
11:20:04
12:10:04
-200
0
200
400
600
800
1000
SYS1_Uncapped SYS1_Capped SYS2_Uncapped SYS2_Capped SYS3_Uncapped SYS3_Capped
SYS4_Uncapped SYS4_Capped SYS5_Uncapped SYS5_Capped GroupLimit AvgUnused (4HRAVG)
Group Capacity: Customer Example
 Group Limit: 875 MSU
 5 Systems on CEC and in Group
 Capping of Group is active when
4HRAVG of group is below 0
MSU

22
RMF z/OS 1.11 Enhancements for Group Capacity…
Field Heading Meaning
CAPPING WLM% Percentage of time when WLM considers to cap the partition
CAPPING ACT% Percentage of time when capping actually limited the usage of processor
resources for the partition

23
WLM Capping
Cap Pattern vs. Phantom Weight
Capping with Cap Pattern (when Soft Cap > MSU@LparWeight)
Capping using a Phantom Weight (when Soft Cap < MSU@LparWeight)
Soft Cap MSU @ LPAR Weight MSU with Phantom Weight

24
Capping WLM% versus ACT%
• Capping WLM% = SMF70NSW * 100 / SMF70DSA
• SMF70NSW is incremented for each Diagnose sample with the WLM-capped flag ON. The
flag is ON if the LPAR was capped via Diagnose 0304.
• Capping ACT% = SMF70NCA * 100 / SMF70DSA
• SMF70NCA is incremented for each Diagnose sample which indicates an actual-MSU-
consumption below the MSU-at-weight factor
• The pricing management adjustment weight of the LPAR (aka phantom weight) is added to the total of all
active-logical-partition weights to compute the fraction of processor resources that the LPAR may use
(MSUatWgt)
• The actual MSU consumption of the LPAR is computed from the total dispatch time measured between two
Diagnose samples
• Following calculations done in RMF after Diagnose 0204 was called:
Current LPAR weight * CPC capacity in MSUs
MSUatWeight = ---------------------------------------------
Total weight + PMA weight
Dispatch time delta * 3600 * 16
ActualMSU = ---------------------------------------
Time range * Phys CPU adjustment factor
If ActualMSU >= MSUatWeight-5% Then LPAR is actually capped

25
Field Heading Meaning
AVAILABLE Long-term average of CPU service units which would be allowed by the limit of the capacity group but are not used by its
members. If the value is negative, this capacity group is subject to capping.

26
Monitor III CPC report in Monitor III Data
Portal displays the projected remaining
time until image/group capping in the report
header
Average available capacity for
the group during last 4 hours

27
New DDS metrics

28
Group Capacity: Availability
Function z/OS V1.12
as previewed 2/2010
z/OS V1.11 z/OS V1.10 Earlier
Releases
Group Capacity plus
OA24096 Enhancements + + OA24096
OA23230
OA24096
OA23230
(z/OS 1.8)
RMF Reporting
Enhancements for Group
Capacity
+ +
z/OS Capacity
Provisioning + + OA20824
 OA24096
– Changes the behavior when then group limit is changed according to the behavior for an individual defined
capacity limit
 OA23230
– Corrects a storage overlay which will occurs when SMF 99 data is collected and a partition is dynamically
activated via HCD
 Short Comings of the existing Group Capacity Report
– Reporting was not sufficient to understand capping of partitions within a group
– Resolved with z/OS 1.8 RMF Reporting Enhancements
 Related z/OS Functions
– z/OS Capacity Provisioning allows to activate additional CPU capacity via OOCoD in a controlled manner.

29
WLM Reporting: Extend Number of Report Classes
 Problem encountered
WLM supported at most 999 report classes which has become insufficient for large installations.
 Solution
Extend number of report classes in multiple steps:
First Step (z/OS 1.11):
Extend to 2047 Report Classes.
Expand internal data structures to be able to deal with 4095 report classes.
Second Step:
Extend to 4095 (the maximum possible value) Report Classes in future release.
Why do we need multiple steps ??
This is to avoid compatibility issues when running a sysplex with lower level releases (z/OS 1.10 and
earlier cannot properly handle more than 2047 report classes).
 Annotation
New WLM functionality level in z/OS 1.11: LEVEL023
For Service Definitions in XML format, the corresponding XML namespace is
http://www.ibm.com/xmlns/prod/zwlm/2009/09/ServiceDefinition.xsd

30
Extended Number of Report Classes
Availability

31
New Programming Interface for Monitors
Control Block: IRARMCTZ
 New extension to SRM Control Table (PI) for information which is of interest for
externalization
– For example all information related to RMF‘s Monitor II OPT report is included in this table
CVTOPCTP ... +254
IRARMCT
...
RMCTX3 ... +178

32
New Programming Interface for Monitors: Availability
Control Block: IRARMCTZ
Function z/OS V1.12
as previewed 2/2010
z/OS V1.11 z/OS V1.10 Earlier
Releases
RMF Monitor II OPT Display + +
WLMOPT Tool (bundled with
WLMQUE Tool)
No longer extended
Still bundled with WLMQUE but on z/OS 1.10 level + Since z/OS 1.8
IRARMCTZ + OA31201 OA31201
 RMF Monitor II OPT Display
– Replaces WLMOPT Tool
• Bundled with WLMQUE Tool but no longer extended (remains on z/OS 1.10 level)
• WLMQUE Tool is still valid (see also WLM Tools summary)
 New data interface for Monitors
– Introduced with z/OS 1.12
– Rollback to z/OS 1.10

33
Enhanced Storage Monitoring
 Problem
– Pageable and Auxiliary storage shortages can lead to serious system problems
(including system outages).
 What needs to be done
– Identify a storage shortage when it occurs.
– Identify the reason (causing application) of the storage shortage.
– Give the installation a chance to react on a storage shortage when it occurs.
 Solution
– Introduce a new set of messages to warn the installation when auxiliary and pageable
storage shortages occur.
– Introduce a WTOR which allows the installation to cancel storage consumers.
– Set storage consumers non-dispatchable to allow the installation to react on the
situation.
– Introduce a set of new programming interfaces (ENF signal) to allow applications to react
on storage shortages.

34
Storage Shortage Management
 Monitors
– Fixed Storage consumption
– Auxiliary Storage
consumption
– Every 2 seconds
 Informs in case of problems
– Operator via messages
– Programs via ENF55
 Takes Actions
– To set Address Spaces non
dispatchable
– To cancel address spaces on
operator request
Page
Dataset
s
inform
Operator
Programs
Cancel AS
Show Consumers
Set Non
Dispatchable

35
Pageable Storage Shortages – Details …
50%
Information Level
• Issue IRA405I: nn% of real storage is fixed
• Issue ENF55
90%
Critical Shortage Level
• Issue IRA401E: Critical Pageable Storage Shortage
• Swaps culprit with the highest increase rate and issues IRA403I
• Optionally: Issue IRA410E and set non-swappable AS non-dispatchable
• If the system is for more than 15s in a critical pageable storage shortage:
Issue IRA420I and IRA421D to allow termination of highest contributors
• for operator and automation
80%
Shortage Level
•Issue IRA400E and IRA404I: Pageable Storage Shortage
•Issue ENF55 with top 20 contributors
•Swaps culprits with the highest increase rate and issue IRA403I
•Optionally: Issue IRA410E and set non-swappable AS non-dispatchable
Note: for Below 16M the shortage targets are 92% and 96%
Real Storage:

36
Auxiliary Storage Shortages – Warning Levels
Page
Datasets 50%
70%
85%
Information Level
• Issue IRA205I: 50% of AUX Storage is allocated
• Issue ENF55
Warning Level
•Issue IRA200E and IRA206I: AUX Shortage
•Issue ENF55 with top 20 contributors
•Swaps culprits with the highest increase and issues IRA210E
•Optionally: Issue IRA210E and make non-swappable AS non-dispatchable
Critical Level
• Issue IRA201E: Critical AUX Shortage
• Swaps culprits with the highest increase and issues IRA210E
• Optionally: Issue IRA210E and make non-swappable AS non-dispatchable
• Issue IRA220I and IRA221D to allow termination of highest contributors
• for operator and automation

37
Storage Enhancements: Availability
Function z/OS V1.12 z/OS V1.11 z/OS V1.10 Earlier
Releases
Reserve Frames for CHNGDUMP
command + +
Enhanced Storage Monitoring
+ + +
Support for >128GB Real Storage
+ + + z/OS 1.8
 Enhanced Storage Monitoring is introduced for z/OS 1.10
 Support for >128GB Real Storage was introduced with z/OS 1.8
 Example: CHNGDUMP SET,SDUMP,BUFFERS=1K
– Reserves frames on the available frame queue for Dump processing (in the
example 256 frames)

38
WLM Tools: A Summary
Tool Name Description Content Support
MIGRATE Goal Mode Migration Aid Assists migration from compatibility to goal
mode
Excel/workstation
SMF/RMF
processing/MVS
No!!
Removed from WLM Tools
page in 2004
WLMZOS OS/390 to z/OS Execution
Velocity Migration
With z/OS the using samples are no longer
sampled but calculated.
The tool helps to understand whether this
changes the amount of delays for service
classes with execution velocity goals
Excel/workstation
SMF processing tool
on MVS
No!!
Removed from WLM Tools
page in 2006
SVDEF Service Definition Formatter Uses output from WLM Administrative
Administration to display content of service
definition in a workstation spreadsheet
Excel/workstation Not updated anymore but
still available on WLM
Tools page
WSE Service Definition Editor Allows to create, mnodify, retrieve and
install WLM service definitions
Java program on
workstation
YES!!
Available
WLMQUE Application Environment
Viewer
Allows to monitor WLM Application
Environments
ISPF Tool YES!!
Available
WLMOPT OPT Display Display WLM/SRM OPT Parameters IPF Tool No!!
Replaced with z/OS 1.11 by
RMF
http://www-03.ibm.com/servers/eserver/zseries/zos/wlm/tools/

39
WLM Tools
Service Definition Editor
WLM
CDS
WLM
ISPF
Tables
read/write
read/write
install
activate
install/activate
(operator command)
Workstation z/OS
FTP

40
WLM Tools
Service Definition Editor

41
WLM Tools
Display WLM/SRM OPT Parameter (WLM Tool, supported up to R10)

42
WLM Tools
Display WLM/SRM OPT Parameter (RMF Monitor II OPT Report)

43
WLM Tools
WLMOPT – WLM Application Environment Viewer

44
Contact Information
Thomas Blattmann
z/OS WLM/SRM Development
IBM Deutschland Research & Development
71032 Böblingen, Germany
E-Mail: blattmann@de.ibm.com

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