The following access method services job allocates a 1-track COMMDS;
//STEP EXEC PGM=IDCAMS
//SYSUDUMP DD SYSOUT=*
//SYSPRINT DD SYSOUT=*
//SYSIN DD *
DEFINE CLUSTER(NAME(SMS.COMMDS1.COMMDS) LINEAR VOL(SMSVOL) -
TRK(1 1) SHAREOPTIONS(3,3)) -
DATA(NAME(SMS.COMMDS1.COMMDS.DATA)REUSE)
/*
This job creates a VSAM linear data
set named SMS.COMMDS1.COMMDS.
The
COMMDS must reside on a shared volume accessible from all systems
in the SMS complex. To ease recovery in case of failure, the COMMDS
should reside on a different volume than the ACDS. Also, you should
allocate a spare COMMDS on a different shared volume.
Recovering Storage Management Subsystem information provides additional information
on the backup and recovery of control data sets. The control data
set (ACDS or COMMDS) must reside on a volume that is not reserved
by other systems for a long period of time because the control data
set (ACDS or COMMDS) must be available to access for SMS processing
to continue.
Recommendations: - Specify the REUSE option when defining the COMMDS data set to
help avoid space problems (SMS reason code 6068) during subsequent
COMMDS updates or IMPORT/EXPORT functions.
- The COMMDS and ACDS must be accessed from all systems in the complex
simultaneously.