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PIDS/565501800 LVLS/510 MS/DFHFC0152 RIDS/DFHFCCA PTFS/UN92873
REGS/GR15 VALU/00000008 PCSS/IDARETLK PRCS/000000A9
+DFHFC0312 ADSWA03A Message DFHFC0152 data set RLSADSW.VF04D.DATAENDB
We used the CEMT command INQUIRE UOWDSNFAIL IOERROR to display
the UOWS that were shunted as a result of the I/O errors. For example, on
the CICS region ADSWA01D the command showed the following shunted
UOWs:
INQUIRE UOWDSNFAIL IOERROR
STATUS: RESULTS
Dsn(RLSADSW.VF04D.TELLCTRL ) Dat Ioe
Uow(ADD18C2DA4D5FC03) Rls
Dsn(RLSADSW.VF04D.DATAENDB ) Dat Ioe
Uow(ADD18C2E693C7401) Rls
2. The next step was to stop the I/O errors by closing the RLS-mode files that
were open against failed data sets. In our example, file F04DENDB was open
against data set RLSADSW.FV04D.DATAENDB, and file F04DCTRL was open
against data set RLSADSW.FV04D.TELLCTRL.
The normal way of closing RLS-mode files across a sysplex is to quiesce the
data set using the CEMT command SET DSNAME QUIESCED in one CICS
region. However, the quiesce operation requires access to the data set, and
fails if the data set cannot be accessed. The alternative is to issue the SET
FILE(F04DENDB) CLOSED and SET FILE(F04DCTRL) CLOSED commands,
which we did using CICSPlex
®
SM to send the command to all the relevant
regions. (Without CICSPlex SM, issue the CEMT SET FILE CLOSED command
to each CICS region individually, either from the MVS console or from a CICS
terminal).
3. To enable CICSVR to recover the failed data sets, we first deleted the catalog
entries for the two affected data sets using the IDCAMS DELETE command:
DELETE RLSADSW.VF04D.TELLCTRL NOSCRATCH
DELETE RLSADSW.VF04D.DATAENDB NOSCRATCH
4. The impact of the recovery process is greater if there are inflight tasks
updating RLS mode files. For this reason, it is recommended at this point that
you quiesce the data sets that are being accessed in RLS mode on other
volumes before terminating the SMSVSAM servers. To determine which data
sets are being accessed in RLS-mode by a CICS region, use the SHCDS
LISTSUBSYSDS subcommand. For example, the following command lists
those data sets that are being accessed in RLS-mode by CICS region
ADSWA01D:
SHCDS LISTSUBSYSDS(’ADSWA01D’)
For the purpose of this example, we did not quiesce data sets; hence there is
no sample output to show.
Note: You can issue SHCDS subcommands as a TSO command or from a
batch job.
5. We terminated the SMSVSAM servers using the MVS command:
ROUTE *ALL,VARY SMS,SMSVSAM,TERMINATESERVER
We received message IGW572 on each MVS image confirming that the servers
are terminating:
IGW572I REQUEST TO TERMINATE SMSVSAM
ADDRESS SPACE IS ACCEPTED:
SMSVSAM SERVER TERMINATION SCHEDULED.
In our example, terminating the servers caused abends of all in-flight tasks
that were updating RLS-mode data sets. This, in turn, caused backout failures
and shunted UOWs, which were reported by CICS messages. For example, the
Chapter 17. Forward recovery procedures 193