Spool migration terms

The following terms and definitions are specific to JES2 spool migration:

Migration: Copying tracks from an existing spool volume to a new or existing spool volume.
Move migration: Migrating an existing, inactive source spool volume to a new target spool volume. The target volume can have an existing spool data set.
Merge migration: Migrating an existing source spool volume to free space on an existing target spool volume.
Pending migration: Migration phase where the $MSPL command has been accepted, but the migration is not yet active.
Source volume: The spool volume that is being migrated to a target spool volume.
Target volume: The new or existing spool volume that the source volume is being migrated to.
Mapped volume: A migrating spool volume that has had its data set copied to a target SPOOL volume, but has not had its jobs and sysout purged.
Mapped target: A spool volume with at least one other spool volume merged onto it.
Active migration: A migrating spool volume that is in a phase between the INITIALIZING and CLEANUP phases, inclusive.
Migrator: The MAS member that is coordinating an active migration.
Migration assistant: The MAS member that is performing work on behalf of the migrator.