By default, the IBM 3494 Virtual Tape Server and the IBM TS7700 Virtualization Engine supports two logical volume sizes 400 MB and 800 MB, which correspond to the supported 3490 media types: cartridge system tape (MEDIA1) and enhanced capacity cartridge system tape (MEDIA2). Using outboard policy management support, the default volume size can be overridden at the library through a data class policy specification. If a maximum volume size is specified in the assigned data class, that volume size will override the default volume size for the volume when it is first mounted. A logical volume's maximum volume size can then change when it is mounted as a scratch volume again. However, for a TS7700 Virtualization Engine at Release 1.6 or higher, the logical volume's maximum size can change when the volume is written from load point, for either a scratch or private (specific) request. Prior to Release 1.6, the TS7700 retained the capacity of the logical volume (on reuse), unless the volume was mounted as a scratch volume. Application configuration-related changes may also be needed to fully utilize the new logical volume sizes. In the case with OAM's Object Tape Support, the TAPECAPACITY parameter in the SETOAM statement of the CBROAMxx PARMLIB member is used to specify the larger logical volumes sizes. For a 1000 MB logical volume, the capacity specified should be 1,000,000 KBs (1000 X 1000). Then for a 2000 MB logical volume, the capacity specified should be 2,000,000 KBs (2000 x 1000) and for a 4000 MB logical volume, the capacity specified should be 4,000,000 KBs (4000 x 1000). Refer to SETOAM statements for object tape storage for a description of the TAPECAPACITY keyword associated with the SETOAM statement. With OA24966, and starting with Release 1.4 of the TS7700 Virtualization Engine (and only with the TS7700 Virtualization Engine), support was added in OAM to obtain the size of the logical volume from the library. With this added support, specification of the TAPECAPACITY keyword may no longer be needed to utilize the capacity of the larger logical volumes, if the needed software support is installed and the IBM virtual tape libraries being used for OAM's object support are all TS7700 Virtualization Engines at Release 1.4 or above. For additional information on outboard policy management refer to z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Tape Libraries.