Auxiliary storage and real storage considerations

To process objects greater than 256MB on the file system sublevel or on tape, the OAM address space uses 64–bit addressing and virtual storage above the 2G bar. OAM usage of virtual storage above the 2G bar will result in significantly increased storage utilization on your system.

Attention: This will require additional capacity planning to back this virtual storage with a robust auxiliary paging subsystem backed by DASD and sufficient real storage. Your planning must be for peak OAM workloads including concurrent application initiated activity and concurrent OSMC processing. See OSMC processing management in an OAMplex for the potential OSMC processing you must consider.

For more information on setting virtual storage limits and backing virtual storage with sufficient real and auxiliary storage see the migration actions in z/OS V2R2 Migration z/OS V2R2 Migration.