Explanation: PLEXNAME(hsmplex_suffix) is an optional parameter that allows you to name multiple HSMplexes within a sysplex. This parameter is used during startup of DFSMShsm and must be specified in an ARCCMDxx member. This parameter must be specified if there are multiple HSMplexes in a sysplex because this HSMplex name is used to distinguish between the separate HSMplexes.
The prefix of ARC is used by DFSMShsm and you can specify a maximum of five characters as the suffix for the HSMplex name. The default suffix used by DFSMShsm is PLEX0.
SMS relationship: Parameter has the same meaning when applied to SMS-managed or non-SMS-managed DASD volumes or data sets.
SETSYS default: By default, SETSYS uses PLEXNAME(PLEX0), which causes DFSMShsm to use an HSMplex name of ARCPLEX0.
DFSMShsm default: If you do not specify this parameter on any SETSYS command, the default HSMplex name is ARCPLEX0.