Assigning volumes to a reserve storage pool

To assign a volume to a reserve storage pool, you initialize the volume using the ICKDSF INIT command with these parameters:

RESERVED: Initializes the volume as reserved, which specifies that it cannot be brought online.
OWNERID: Specifies the name of the reserve storage pool, in the form IBMRSPrspname where rspname is the name of the reserved storage pool (up to 8 characters). OWNERID is optional.

A volume that has been initialized as reserved cannot be brought online. Before it can be brought online, it must be re-initialized without the RESERVED keyword. For more information, refer to the topic about the INIT command in Device Support Facilities (ICKDSF) User's Guide and Reference.

A volume that has been initialized as reserved is not to be confused with a device for which a system issues a hardware RESERVE, either through the RESERVE or ISGENQ macros, to ensure successful serialization of shared DASD. For more information, refer to z/OS MVS Programming: Authorized Assembler Services Reference LLA-SDU or z/OS MVS Programming: Authorized Assembler Services Reference EDT-IXG.