Example: DFSMShsm serialization configuration

Figure 1 illustrates the expected configuration of DFSMShsm resources when the CDSR=YES and DFHSMDATASETSERIALIZATION options are being used. The control data sets and the journal are in the SYSTEMS exclusion RNL with a QNAME of ARCGPA and RNAMES of ARCMCDS, ARCBCDS, ARCOCDS, and ARCRJRN. The exclude of the ARCGPA resource allows the reserves to protect the control data sets. Therefore, CDS backup and journal backup are serialized by volume reserves and not by global enqueue serialization.

The RESERVE conversion RNL entries, ARCBACV and ARCMIGV, are meaningful only if the SETSYS DFHSMDATASETSERIALIZATION command has been specified. If SETSYS USERDATASETSERIALIZATION has been specified, reserves using these RNAMES are not issued.

Figure 1. Access Priority Name List (Configuration 1)

Note: ARCBACV and ARCMIGV should be converted only if GRS or a GRS-like product propagates enqueues for the SYSDSN resource to all shared systems. Converting these reserves without this cross-system propagation of SYSDSN enqueues removes the necessary cross-system serialization and risks loss of data.

Figure 2 is an example of the GRS RNLDEF statements for Figure 1.

Figure 2. RNLDEF Statements that Define the Example Configuration

RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(ARCAUDIT)
RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(ARCBACK)
RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(ARCGPA)
RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(ARCGPAL)
RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(ARCUPDT)
RNLDEF RNL(CON) TYPE(GENERIC) QNAME(ARCBACV)
RNLDEF RNL(CON) TYPE(GENERIC) QNAME(ARCMIGV)