Procedure

Some wait and loop failures involve reading or writing data to a damaged VSAM data set. To determine whether you have a damaged data set, use the IDCAMS EXAMINE command as described in the topic on functional command format in z/OS DFSMS Access Method Services Commands and the topic on checking a VSAM key-sequenced data set cluster for structural errors in z/OS DFSMS Using Data Sets. The EXAMINE command provides details about the nature of data set damage.
Waits or loops can occur in several VSAM modules because of a damaged VSAM data set. The most commonly involved modules are:
- IDA019RA
- IDA019RI
- IDA019R2
- IDA019RB
- IDA019RJ
- IDAM19R3 (IDA019R3)
- IDA019RC
- IDA019RN
- IDA019SE
- IDA019RE
- IDA019RW
- IDA019SY
- IDA019RH
- IDA019RY
A loop might also be indicated by the reissuing of either SVC121 (X'79') or Start Subchannel (SSCH). If an apparent wait occurs and a console dump is taken, the following symptom might indicate the involvement of a damaged data set:
- SVC01 WAITs issued by module IDA019RZ
Use IEBGENER to copy the SYS1.LOGREC data set to a standard label tape. This data set contains the event history leading up to the wait problem.
See Module keyword.