Preventing further migration to a DASD migration volume

Although the FREEVOL and MIGRATE commands can be used to empty migration volumes, the command does not prevent further use of the volumes. To prevent a migration volume from accepting any further migration copies, issue the following command:

ADDVOL volser UNIT(unittype) MIGRATION(DRAIN)

The DRAIN parameter prevents an ML2 volume from being associated with a key range, thus preventing the volume from being used for migration output. However, if an ML2 volume that has already been associated with a key range is given the DRAIN parameter in an ADDVOL command, that volume remains eligible to be used for migration output.

If you want to prevent such a volume from being used, you must first issue a DELVOL command with the UNASSIGN parameter; then issue an ADDVOL command with the DRAIN parameter. To determine which DASD ML2 volumes are associated with key ranges, use the QUERY MIGRATIONLEVEL2 command.