You would use OAM in a mainframe environment. To take advantage of the full range of OAM capabilities, the environment should provide substantial amounts of internal and external storage. In addition to standard direct access storage device (DASD) devices, OAM also uses optical disk drives and tape devices inside of and outside of ATLDSs and MTLs within an object storage environment. OAM also supports zFS on DASD devices, as well as NFS file systems exported from NFS servers and mounted in the z/OS UNIX storage hierarchy. OAM does not have any hardware prerequisites; however, you can expand internal and external storage capacities to accommodate an increased work load.