You can use the F OAM,START,OSMC command to start OSMC processing for Object storage groups only. If you issue an F OAM,START,OSMC command, OSMC starts all Object storage groups whose OSMC processing system name is blank or matches the system name on which the command was issued. You can use the F OAM,S,STORGRP command to start OSMC processing for either Object or Object Backup storage groups. The F OAM,START,STORGRP,storagegroup command is always honored on the system where the command is issued, even if another system name is specified in the processing system name.
Recommendation: Try to localize the OSMC processing to the system where the hardware is physically online for that storage group to reduce the amount of cross-system processing that is required. Also, if multiple systems are running different storage groups at a time, the impact to DB2 should be analyzed (especially if normal activity to the storage group is occurring at the same time).