Tailoring the IMS execution JCL
Each CPC in an XRF complex has an IMS job running continuously. z/OS® START commands use two different procedures to initialize the active IMS and the alternate IMS.
The XRF-related parameters in the control region EXEC statement are as follows:
- HSBID=
- Specified as HSBID=1 in one procedure and HSBID=2 in the other. HSBID=null deactivates XRF capability. If you bring up a third IMS as an alternate IMS after a takeover, specify HSBID= the same as on the failed active IMS.
- HSBMBR=
- Specified as a 2-character suffix that corresponds to a DFSHSBxx member included in IMS.PROCLIB. This member is where the control information and takeover criteria are specified.
- MNPS=
- Defines XRF as using MNPS and specifies the name of the MNPS ACB. The MNPS= keyword in the EXEC statement overrides the MNPS= and USERVAR= keywords in the DFSHSBxx PROCLIB member.
- MNPSPW=
- Defines a password to be used with the MNPS ACB name that is specified in the MNPS= keyword. This is an optional keyword that overrides specifications that are made in the DFSHSBxx PROCLIB member. If VTAM® is configured to check passwords, it is this password that VTAM checks. If it is not specified and VTAM expects one, the MNPS ACB is not opened.
- USERVAR=
- Specifies the USERVAR name. If an MNPS ACB name has been defined using the MNPS= keyword, this keyword is ignored.