CA-MIM resource sharing
TDMF periodically issues a reserve macro (TDMFRESV) to the volume where the Communications data set (COMMDS) is resident. Dependent on how certain parameters are set within Multi-image Manager (MIM), this could cause the reserve to be converted by MIM to a global enqueue.
The following procedure helps determine what actions need to be taken to avoid this reserve conversion. This information has been supplied courtesy of CA-MIM Technical Support.
- Go into the MIMINIT deck and search for PROCESS=
The options available are SELECT or ALLSYSTEMS. The differences between these two options are described as follows:
- PROCESS=SELECT tells MIM to only manage and convert the enqueues and reserves that are indicated in the MIMQNAMES list and GDIEXMPT list.
- PROCESS=ALLSYSTEMS directs MIM to manage all enqueues and reserves that have a SCOPE=SYSTEMS unless the qname is specified in the MIMQNAMES list with GDIF=NO, or the data set is specified in the GDIEXMPT list via a LOCAL statement.
- To prevent MIM from converting the RESERVE to a global enqueue
for the COMMDS data set, do one of the following:
- If running with GDIINIT PROCESS=SELECT:
Do not define the TDMFRESV qname to MIM via the MIMQNAME member.
- If running with GDIINIT PROCESS=ALLSYSTEMS:
Define the following to the MIMQNAME member
TDMFRESV GDIF=NO
- If running with GDIINIT PROCESS=SELECT:
If assistance is required to code the MIM parameters, please contact CA-MIM Technical Support. Multi-image Manager (MIM) release 4.1 and above supports four (4) digit UCBs. Support for UCBs above the 16-MB line for disk and tape is available at maintenance level 9608. Support for CTC UCBs above the 16-MB line is available at maintenance level 9706.
For those customers using GRS, refer to Coexistance with EMC’s z/OS migrator.