Compress Data Compression uses hardware RESERVEs to serialize updates to its Analysis and Control files. Hardware RESERVE contention problems are possible, especially in the BrightStor CA-Compress started task as it processes concurrent I/Os to the Control File. If the hardware RESERVE on the Control File is not converted to a global SCOPE=SYSTEMS ENQ request and SYNCHRES(YES) is specified in SYS1.PARMLIB(GRSCNFxx), Compress Control File I/O is likely to hang, stopping the started task and any user job waiting for the Control File I/O to complete. Performance penalties caused by needless waiting are less serious, but worth avoiding.
We therefore advise you to use your multi-system serialization product to convert Compress hardware RESERVE requests.
IBM Global Resource Serialization (GRS) users should add the following two statements to the RNL RESERVE section in SYS1.PARMLIB member GRSRNLxx:
RNLDEF RNL(CON) TYPE(GENERIC) NAME(SYSxxxx)
RNLDEF RNL(CON) TYPE(GENERIC) NAME(SHRINKFE)
Unicenter CA-Mult-image Manager (CA-MIM) users should place the following two statements in member MIMQNAME in the CA-MIM parmlib:
Note: In SYSxxxx, xxxx is the Compress subsystem name as you have installed it, equal to the first four characters of the Compress started task name.