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This clears the SMSVSAM CFVOL-QUIESCED state and allows SMSVSAM
RLS access to the volume. CICS ensures that access is not allowed to the
data sets that will eventually be forward recovered, but the volume is
available for other data sets.
6. Run data set forward recovery jobs.
The following two examples show forward recovery after the loss of a volume,
based on the procedure outline above:
Example of recovery using data set backup:
For this illustration, involving two data sets, we simulated the loss of a volume by
varying the volume offline. The two data sets (RLSADSW.VF04D.DATAENDB and
RLSADSW.VF04D.TELLCTRL) were being updated in RLS mode by many CICS
AORs at the time the volume was taken offline. The CICS file names used for these
data sets were F04DENDB and F04DCTRL.
The failed data sets were recovered onto another volume without first recovering
the failed volume. For this purpose, you have to know what data sets are on the
volume at the time of the failure. In “Example of recovery using volume backup”
on page 196, we describe the recovery process by performing a volume restore
before the forward recovery of data sets. Here are the steps followed in this
example:
1. We simulated the volume failure using the MVS command:
ROUTE *ALL,VARY 4186,OFFLINE,FORCE
The loss of the volume caused I/O errors and transaction abends, producing
messages on the MVS system log such as these:
DFHFC0157 ADSWA04B 030
TT1P 3326 CICSUSER An I/O error has occurred on base data set
RLSADSW.VF04D.TELLCTRL accessed via file F04DCTRL component code
X’00’.
DFHFC0158 ADSWA04B 031
96329,13154096,0005EDC00000,D,9S4186,A04B ,CICS
,4186,DA,F04DCTRL,86- OP,UNKNOWN COND. ,000000A5000403,VSAM
DFHFC0157 ADSWA03C 301
DE1M 0584 CICSUSER An I/O error has occurred on base data set
RLSADSW.VF04D.DATAENDB accessed via file F04DENDB component code
X’00’.
DFHFC0158 ADSWA03C 031
...
As a result of the transaction abends, CICS attempted to back out in-flight
UOWs. The backouts failed because CICS couldn't access the data sets on the
lost volume. The associated backout failures were reported by CICS, as
follows:
+DFHFC4701 ADSWA03A 336
11/24/96 13:15:48 ADSWA03A Backout failed for transaction DE1H, VSAM
file F04DENDB, unit of work X’ADD18C07DCB70A05’, task 46752, base
RLSADSW.VF04D.DATAENDB, path RLSADSW.VF04D.DATAENDB, failure code
X’24’.
+DFHFC0152 ADSWA03A 339
11/24/96 13:15:49 ADSWA03A ???? DE1H An attempt to retain locks for
data set within unit of work X’ADD18C07DCB70A05’ failed. VSAM return
code X’00000008’ reason code X’000000A9’.
+DFHME0116 ADSWA03A 340
(Module: DFHMEME) CICS symptom string for message DFHFC0152 is
192 CICS TS for z/OS 4.1: Recovery and Restart Guide