The FS_MAPPER feature provides support for swap in the IOM. It requires either the IDE_DISK or SCSI_DISK to be configured, as well as VIRTUAL_ADDRESS_SPACE and ON_DEMAND_PAGING.
FS_MAPPER
IDE_DISK
SCSI_DISK
VIRTUAL_ADDRESS_SPACE
ON_DEMAND_PAGING
For more details, see FS_MAPPER(5FEA).