HOSTMODE (default = MAIN)

Specifies how this instance of DFSMShsm is related to various functions of DFSMShsm.

HOSTMODE=MAIN specifies that this DFSMShsm:

Processes implicit requests, like recalls and deleting migrated data sets, from user address spaces
Processes explicit commands from TSO, like HSENDCMD and HBACKDS
Manages ABARS secondary address spaces
Allows MODIFY commands from a console
Can run an automatic backup, dump, and space management

Within a z/OS image, only one DFSMShsm can operate in this mode and any other DFSMShsm host in that image must have HOSTMODE=AUX.

HOSTMODE=AUX specifies that this DFSMShsm:

Within a z/OS image, zero or more DFSMShsm hosts can operate in this mode.

If HOSTMODE is not specified, the default is MAIN.