z/OS Small Enhancements - Episode 2016A

© Copyright IBM Corporation 2016. Technical University/Symposia materials may not be reproduced in whole or in part without the prior written permission of IBM.
Small z/OS enhancements over the past several releases
Marna WALLE, mwalle@us.ibm.com
Member of the IBM Academy of Technology
z/OS System Installation
IBM z Systems, Poughkeepsie NY USA

© 2016 IBM Corporation2
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Therefore, no assurance can be given that an individual user will achieve throughput improvements equivalent to the performance ratios stated here.
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No other workload processing is authorized for execution on an SE.
IBM offers SEs at a lower price than General Processors/Central Processors because customers are authorized to use SEs only to process certain
types and/or amounts of workloads as specified by IBM in the AUT.

• z/OS V2.2:
•ISPF: z/OS UNIX Mounted File Systems
• z/OS V2.1:
SDSF: New system information panels
BCP: SETSMF without PROMPT at IPL
BCP: Logon allocation message
• z/OS V1.13:
DFSMS: PDSE handy commands
BCP and DFSMS: Verbose message control
 z/OS V1.12:
•DFSMS: IDCAMS VERIFY with RECOVER
• Older than the hills:
•BCP: Tape Library Load Balancing
•Communications Server: REXX ftp client API
•RACF: Logon statistics suppression
z/OS Little Enhancements - Edition 2016A

= Sysprog
= Sysprog & Users © 2007 IBM Corporation
z/OS V2R2
Little Enhancements
ISPF: z/OS UNIX Mounted File Systems

 What: The ISHELL Mount Table is very difficult to work with, especially for a lot of
mounted file systems.
– Can’t find values easily, can’t see consolidated the file system name and
mountpoint, multiple deep steps to get handy information…
 z/OS V2.2 ISPF allows easy viewing/changing of the mount table!
– “Twisties” help consolidate similarly named file systems and mount points.
– Think: SMP/E FIXCAT Explorer.
– A helpful find command!
– File systems and mount points are shown together!
 How to use:
1. ISPF 3.17, File System -> Mount Table by File System or Mount Table by Mount
Point.
2. Expand, collapse, find, modify at will.
 Considerations:
– No PF11 (right) and PF10 (left) support .
– Just try it out, and you’ll never go back to the ISHELL Mount Table.
z/OS V2R2 Enhancements
ISPF: z/OS UNIX Mounted File Systems

Existing ISHELL: No find command, but there is an unhelpful locate command.

Three levels deep (when I finally find the file system I want)
to see mount point, file system type, …
Existing ISHELL:

New ISPF 3.17…two excellent “views”:

New ISPF 3.17 “Mount Table by File System”:

New ISPF 3.17 “Mount Table by File System”: xa for “expand (and collapse) all
Can xa on the command
line for all file system
names too.

New ISPF 3.17 “Mount Table by File System”: easily understood hierarchy.
Notice file system and mount point are clearly identified together!

New ISPF 3.17 “Mount Table by File System”: easy find!

New ISPF 3.17 “Mount Table by Mount Point”: … the reverse view

(Options -> Mount Table Column Arrangement)
Mount Table Mount Point customization:
Mount Table File System customization:

© 2007 IBM Corporation
z/OS V2R1
Little Enhancements
= Sysprog
= Sysprog & Users
SDSF: New system information panels
BCP: SETSMF without PROMPT at IPL
BCP: Logon allocation message

 What: An SPE on z/OS V2.1 and V2.2 SDSF (PI43902, and a BCP PPT
update in OA48578), you can easily see system information:
– SYS - System information
– LNK – Link list data sets
– LPA – Link pack data sets
– APF – APF data sets
– PAG – Page data sets
– PARM – Parmlib data sets
– …and SRCH within the returned data sets for members!
 How to use:
1. Set up SDSFAUX address space
2. Start enjoying the new panels.
z/OS V2R1 SPE Enhancements
SDSF: New system information panels

 Set up SDSFAUX address space
– SDSF server address space continues to be optional (and recommended!) The server must
be started to use this new function.
– When SDSF server is started, the new SDSFAUX address space is automatically started.
– SDSFAUX will automatically stop when SDSF server is stopped.
– Only one SDSFAUX per system, and can be used by multiple SDSF servers.
– Can start manually with S SDSFAUX (and stop with P SDSFAUX)
 Considerations:
– Recent APARs PI54862 and PI56151 may help.
– APAR= PI54862: ISF452E SDSFAUX COMMUNICATIONS FAILED, RETURN CODE
0X00000008, RC= 0X00360806" RECEIVED WHEN USING NEW SDSF COMMANDS
– APAR= PI56151: MESSAGE HSF0067E CSVDYLPA ADD FOR MODULE HSFSRVRM
FAILED RC=4 RSN=00000401 DIAG=20004001.AT SDSFAUX STARTUP
– Doc for the new function is in SDSF Operation and Customization:
– V2.2: SA23-2274-03
– V2.1: SA23-2274-01

 How to set up SDSFAUX:
1. Copy the sample SDSFAUX (which is an alias of HSFSRJCL) from SISFJCL to your
proclib concat, and call it SDSFAUX.
– You can call it something else, but you’d need to update ISFPRMxx to give the name
if you didn’t use SDSFAUX.
– Check the proc, but you shouldn't need to make any updates.
2. SDSFAUX address space requires that SISFLOAD be in either the system linklist (or
be in the STEPLIB or JOBLIB).
3. Set up security for SDSFAUX address space.
– SAF SDSF class must be RACLISTed.
– Define userid associated with SDSFAUX address space (same as SDSF server is
fine).
– Add a profile in the STARTED class for SDSFAUX.* (or you can use your existing
SDSF*.* which is also fine).
4. Set up security for new panels for users. Plenty o’ profiles to control commands on
new panels.

SDSF: New system information panels - SYS

SDSF: New system information panels – SYS, DAL

SDSF: New system information panels – LNK

SDSF: New system information panels – LNK, SRCH

SDSF: New system information panels – LNK, SB

SDSF: New system information panels – PAG

= D ASM,LOCAL
SDSF: New system information panels – PAG, DL

 What: To use the SETSMF command (prior to V2.1) you had to have specified PROMPT(..)
in SMFPRMxx at IPL. However, folks didn’t want to specify PROMPT(..) at IPL.
– The SETSMF command is less disruptive than a SET SMF=xx command (which resets the
entire parmlib member).
 New statement in SMFPRMxx AUTHSETSMF|NOAUTHSETSMF can control whether you want
(or don’t want) to be able to use SETSMF after IPL.
– By allowing SETSMF when NOPROMPT is specified allows the majority of installations to
avoid delays at IPL.
 How to use:
Specify AUTHSETSMF in SMFPRMxx at IPL. Keep NOPROMPT if you like.
– You cannot SETSMF to change AUTHSETSMF!
 Considerations:
– When AUTHSETSMF is specified, the SETSMF command is authorized, regardless of the
specification of PROMPT or NOPROMPT.
– When NOAUTHSETSMF is specified, the SETSMF command is not authorized, regardless
of the specification of PROMPT or NOPROMPT
BCP: SETSMF without PROMPT at IPL

z/OS R13: D SMF,O then trying to do a SETSMS command with SMFPRMxx NOPROMPT
IEE970I explanation: The operator entered a SETSMF command. The SMFPRMxx parmlib
member in effect includes the NOPROMPT option, which makes SETSMF an incorrect
operator command.

z/OS V2.1: Added AUTHSETSMF (keeping NOPROMPT) to SMFPRMxx

z/OS V2.1: D SMF,O then doing a SETSMS command with SMFPRMxx
AUTHSETSMF and NOPROMPT … SUCCESS!

 What: It’s particularly annoying if you are trying out a new logon proc,
have an allocation failure for a referenced data set. This isn’t helpful:
MWALLE LOGON IN PROGRESS AT 18:25:28 ON JUNE 29, 2015
LOGON FAILED ALLOCATION UNSUCCESSFUL
MWALLE LOGGED OFF TSO AT 18:25:28 ON JUNE 29, 2015
IKJ56400A ENTER LOGON OR LOGOFF-
– Now, allocation will issue messages to the terminal to tell you exactly
where the problem is!
 How to use:
1. Read new message IEFA107I during logon.
2. Fix the problem you were told about.
 Considerations:
– Only indicates the first allocation error. You will have to read and fix
each problem iteratively.
BCP: Logon allocation message

BCP: Logon allocation message
IEFA107I
output

z/OS R13
Little Enhancements
DFSMSdfp: Some PDSE handy commands
 BCP and DFSMSdfp: Verbose message control
= Sysprog
= Sysprog & Users

z/OS R13 Enhancements
DFSMSdfp: Some PDSE handy commands
Background:
 Two kinds of PDSE corruption: 1) in memory, and 2) on DASD.
 SMSPDSE is non-restartable and is used for linklist PDSEs. SMSPDSE1
is restartable, for non-linklist PDSEs.
What:
 For problem determination, to find where a PDSE is currently being
used.
– D SMS,{PDSE|PDSE1},CONNECTIONS,DSN(dsname)[,VOL(volser)]
 To help with PDSE corruption in memory, to discard the buffered
directory pages for a specific PDSE. (The next access will come from
the data set on DASD).
– VARY SMS,{PDSE|PDSE1},REFRESH,DSN(dsname)[,VOL(volser)]
 To help with PDSE corruption on DASD detection (not correction), use
IEBPDSE utility.
– Suggestion: put IEBPDSE as the first step of batch jobs using critical PDSEs.

DFSMSdfp: Some PDSE handy commands
How to use. A sample non-serialization scenario:
1. You receive message ADR795E or ADR796E
– (ttt)-mmmmm(yy), AN UNEXPECTED RETURN CODE (return_code) AND REASON CODE
(reason_code) HAS BEEN RECEIVED FROM THE IGWNOTIF MACRO WHILE PROCESSING
VOLUME volume_serial_number (((or DATA SET dsname )))
2. Find out who is using the PDSE:
– D SMS,PDSE1,CONNECTIONS,DSN(MWALLE.UTIL.JOBS)
IGW051I PDSE CONNECTIONS Start of Report(SMSPDSE1)
---------data set name---------------------- -----vsgt-------
MWALLE.UTIL.JOBS 01-ZOS002-000204
--asid-- --name-- --tcb--- -open-
0095 MWALLE 009FF158 Input
PDSE CONNECTIONS End of Report(SMSPDSE1)
3. Try to access the PDSE from another system. If you can access from another system,
then the corruption is likely in-storage. (Since buffers are system-specific.)
– Refresh the in-storage buffers for the PDSE:
– VARY SMS,PDSE1,REFRESH,DSN(MWALLE.UTIL.JOBS)
IGW052I The cached directory blocks for PDSE MWALLE.UTIL.JOBS have
been discarded
4. If you cannot access from both systems, likely the PDSE is corrupted on DASD:
– //STEPCHK EXEC PGM=IEBPDSE,PARM='DUMP'
//SYSPRINT DD SYSOUT=*
//SYSLIB DD DSN=MWALLE.UTIL.JOBS,DISP=SHR

z/OS R13 Enhancements (with OA37957 and OA37505)
BCP and DFSMSdfp: Verbose message control
What:
 There are many messages (specifically DFSMS O/C/EOV abend IEC*
messages) which could be more helpful in providing information to the end user.
– You can spend a lot of time looking up a message, just to then have to look
the specific return code from a very long list.
– Wouldn’t it be nice if the message just told you in “English” what had
happened?
How to use: .MSGOPTION VERBOSE(Y) in MPFLSTxx controls if verbose
messages will be produced.
– VERBOSE(Y) Verbose messages will be produced in the joblog, and extra
lines will not be produced in the syslog or operlog or queued to console.
– VERBOSE(N) Verbose messages will not be produced. Same behavior as it’s
been all along.
Considerations:
 Right now, verbose messages are exploited only by these IEC* messages.
 Additional verbose message lines are visible in MPF exits and on the Subsystem
Interface (SSI).

Example of not using verbose message control:
D MPF
IEE677I 15.48.20 MPF DISPLAY 941
…
SUBSYSTEMS RECEIVING FOREIGN MESSAGES AND DOMS:
*ALL
MSG OPTIONS: NONE
FIELD -MPF COLOR HLIGHT INTEN FIELD -MPF COLOR …
1.
2.
IEF403I BADOPEN - STARTED - TIME=16.03.50
IEC142I 113-2C,IFG0194D,BADOPEN,FIX1,SYSUT1,0981,PAGE08, 016
SYS1.COMMON.DATA
IEA995I SYMPTOM DUMP OUTPUT 017
SYSTEM COMPLETION CODE=113 REASON CODE=0000002C
TIME=16.03.50 SEQ=00010 CPU=0000 ASID=0027
PSW AT TIME OF ERROR 075C1000 80D12336 ILC 2 INTC 0D
NO ACTIVE MODULE FOUND
… Syslog and joblog information

Example of using verbose message control:
3.
SET MPF=MW
IEE252I MEMBER MPFLSTMW FOUND IN SYS1.PARMLIB.POK
IEE712I SET MPF PROCESSING COMPLETE
4.
D MPF
IEE677I 16.04.28 MPF DISPLAY 029
…
SUBSYSTEMS RECEIVING FOREIGN MESSAGES AND DOMS:
*ALL
MSG OPTIONS: VERBOSE
FIELD -MPF COLOR HLIGHT INTEN FIELD -MPF COLOR …
5.

Example using verbose message control:
SYS1.COMMON.DATA
TIME=16.04.52 SEQ=00011 CPU=0000 ASID=0027
6.
Syslog information
SYS1.COMMON.DATA
ERROR DESCRIPTION: IEC142I
An OPEN was issued for a VSAM data set with a DCB, but the caller
was not APF authorized or not in supervisor state.
END ERROR DESCRIPTION: IEC142I
TIME=16.04.52 SEQ=00011 CPU=0000 ASID=0027
7.
Joblog information !
(same as in book)
Syslog information

z/OS R12
Little Enhancements
DFSMS: IDCAMS VERIFY with RECOVER
= Sysprog
= Sysprog & Users

What:
 Using the EXAMINE command for a VSAM data set that was closed
improperly, can result in a cc 8 because of an interrupted VSAM
process.
 As of R12, you can complete or back out the interrupted VSAM
process by adding the RECOVER parameter to the VERIFY
command.
– VERIFY without RECOVER will only update the end of data (EOD) and end of key range (EOKR) catalog
information so that it is accurate when the data set is next opened.
 Then, check for any remaining errors using the EXAMINE command
for the data set again.
Consideration: The data set cannot already be opened on any
system, or VERIFY RECOVER will fail with an OPEN error.
 IBM recommends that you specify the RECOVER parameter after an
improper close of a key-sequenced data set.
DFSMS: IDCAMS VERIFY with RECOVER

Example:
EXAMINE NAME(MWALLE.TESTCSI.CSI) INDEXTEST DATATEST
IDC3300I ERROR OPENING MWALLE.TESTCSI.CSI
IDC3351I ** VSAM OPEN RETURN CODE IS 116
IDC31704I DATA SET IS ALREADY OPEN FOR OUTPUT OR WAS NOT
CLOSED CORRECTLY
IDC3003I FUNCTION TERMINATED. CONDITION CODE IS 12
IDC0002I IDCAMS PROCESSING COMPLETE. MAXIMUM CONDITION CODE
WAS 12
1.
2. VERIFY DATASET(MWALLE.TESTCSI.CSI) RECOVER
IDC3300I ERROR OPENING MWALLE.TESTCSI.CSI
IDC3351I ** VSAM OPEN RETURN CODE IS 118
IDC0001I FUNCTION COMPLETED, HIGHEST CONDITION CODE WAS 0
WAS 0
Attention message: The data set was
not properly closed but OPEN's implicit
verify was successfully processed.

Example:
EXAMINE NAME(MWALLE.TESTCSI.CSI) INDEXTEST DATATEST
IDC01700I INDEXTEST BEGINS
IDC11773I 1 KEYS PROCESSED ON INDEX LEVEL 1, AVERAGE KEY..
IDC11774I CURRENT INDEX CISIZE IS 4096, RECOMMENDED MINIMUM
INDEX CISIZE IS 15
IDC01724I INDEXTEST COMPLETE - NO ERRORS DETECTED
IDC01701I DATATEST BEGINS
IDC01709I DATATEST COMPLETE - NO ERRORS DETECTED
IDC01708I 1 CONTROL INTERVALS ENCOUNTERED
IDC01710I DATA COMPONENT CONTAINS 1 RECORDS
IDC01711I DATA COMPONENT CONTAINS 0 DELETED CONTROL INTERVALS
IDC01712I MAXIMUM LENGTH DATA RECORD CONTAINS 80 BYTES
IDC01722I 99 PERCENT FREE SPACE
IDC0001I FUNCTION COMPLETED, HIGHEST CONDITION CODE WAS 0
WAS 0
3.

Older than the hills
Little Enhancements
BCP: Tape Library Load Balancing
Communications Server: REXX interface for
ftp client
RACF: Logon statistics suppression
= Sysprog
= Sysprog & Users

Older than the hills (z/OS R11, back to R9):
BCP: Tape Library Load Balancing
What: A new optional algorithm for all non-specific tape requests (i.e.scratch) to be balanced
across tape libraries based on the number of devices in the library, all other things being equal.
 Otherwise (default) the tape requests are equally random across libraries, and may be
“unfair”.
How to use: As expected, use SETALLOC and ALLOCxx:
1. SETALLOC SYSTEM,TAPELIB_PREF=BYDEVICES
– To revert back: SETALLOC SYSTEM,TAPELIB_PREF=EQUAL
2. To make permenant in ALLOCxx: SYSTEM TAPELIB_PREF(EQUAL|BYDEVICES)
3. D ALLOC,OPTIONS To query current options
Considerations:
 No prerequisities. All done in Allocation.
 If you have only one tape library, or tape libraries with the same number of devices, this new
algorithm will have no effect.
 This function is particularly attractive if you are adding new tape libraries (with lots of devices),
and want to reduce a chance of overload onto the older tape libraries (with fewer devices).
 Remember to make a dynamic change permanent, to avoid regression.

Example Without Tape Library Load Balancing:
TAPELIB_PREF(EQUAL)
…
1024 tape devices
8 tape devices
Scratch tape request
½ = 50%
½ = 50%Equally likely

Example With Tape Library Load Balancing:
TAPELIB_PREF(BYDEVICES)
…
1024 tape devices
8 tape devices
Scratch tape request
1024 / (1024+8) = 99.2%
128 times more likely
8 / (1024 + 8) = 0.7%

 What: REXX interface means you can easily write programs to use ftp!
– In addition to Java, C, COBOL, PL/I, and assembler.
 How to use:
– Handy sample is found in TCPIP.SEZAINST(EZAFTPIR)
– Understand the FCAI stem variables, which represents an instance of use.
– result = ftpapi(stem, request_type, parm1, parm2, ...)
1. ftpapi('fcai.', 'create', mytraceid) create the fcai
2. ftpapi('fcai.', 'init', myserver, myvar1, myvar2) open a connection
3. ftpapi('fcai.', 'scmd', my_subcommand, 'W') do an ftp subcommand
4. ftpapi('fcai.', 'term') terminate the connection, but
you should subcommand quit first to get the trace information.
 Considerations: Connecting to an ftp server that can accept an anonymous
userid is ideal. I had to provide my password “in the REXX”, if not.
 Doc: z/OS Communications Server: IP Programmer's Guide and Reference
Older than the hills (z/OS R8):
Communications Server: REXX ftp client API

My REXX EXEC, based on EZAFTPIR:

My REXX EXEC SAYs:

My REXX EXEC, FTP connection messages:

What: Allows you to specify which applications should only record the first system access of a
day. This could result in reduced I/O and lowered serialization impacts on the RACF data set.
 Affects applications that specify the APPL operand on RACROUTE REQUEST=VERIFY
How to use: APPL profiles are used to specify which applications take advantage of this function.
1. Determine which applications you want to have only the first access of the day recorded.
2. Create or Modify the profile in the APPL class for the application to only record the first
time that day’s access in APPLDATA:
– New: RDEFINE APPL applname UACC(NONE) APPLDATA('RACF-
INITSTATS(DAILY)')
– Then: PERMIT applname CLASS(APPL) ID(userid-or-group)
ACCESS(READ)
– Existing: RALTER APPL applname APPLDATA(‘existing data RACF-
INITSTATS(DAILY)')
3. Activate the APPL class, if necessary: SETROPTS CLASSACT(APPL) RACLIST(APPL)
– If already active and RACLISTed, then refresh: SETROPTS RACLIST(APPL) REFRESH
Considerations: LJDATE, LJTIME, USBD_LASTJOB_DATE, and USBD_LASTJOB_TIME fields
will have the last recorded date and time for that day, not the last actually used for that day.
RACF: Logon statistics suppression

RACF: Logon statistics suppression

Summary of What We Might Want to Share:
• System Programmer & User Items:
ISPF (V2.2): z/OS UNIX Mounted File Systems
SDSF (V2.1): New system information panels
BCP (V2.1): Logon allocation message
BCP and DFSMS (R13): Verbose message control
DFSMS (R12): IDCAMS VERIFY with RECOVER
Communications Server (old): REXX ftp client API
• System Programmers’ Items:
BCP (V2.1): SETSMF without PROMPT at IPL
DFSMSdfp (R13): PDSE handy commands
BCP (old): Tape Library load balancing
RACF (old): Logon statistics suppression

z/OS Little Enhancements – Edition 2016A: Summary
• z/OS V2.2:
•ISPF: z/OS UNIX Mounted File Systems Excellent helpful views!
• z/OS V2.1:
SDSF: New system information panels Offers handy in-context
information.
BCP: SETSMF without PROMPT at IPL Better availability and flexibility.
BCP: Logon allocation message A real time saver.
 z/OS V1.13:
DFSMS: PDSE handy commands Could save an IPL.
BCP and DFSMS: Verbose message control No more lookup.
 z/OS V1.12:
•DFSMS: IDCAMS VERIFY with RECOVER Fix it for availability.
• Older than the hills:
•BCP: Tape library load balancing Treats your tape requests fairly.
•Communications Server: REXX ftp client API Very easy to use.
•RACF: Logon statistics suppression To reduce I/O and contention.

z/OS Small Enhancements - Episode 2016A

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