ARC0508I

Explanation
 A data set is migrating to a DASD migration level
2 volume volser. This can occur as a result of
level migration to level 2 DASD, migration of a volume to level 2
DASD, or migration of an individual data set to level 2 DASD. The
allocation failed for the DASD migration level 2 volume that was associated
to the key range lowkey to highkey to
which the data set name belongs. See the corresponding ARC0500I or ARC0503E message (from the command log) for the
specific reason that the allocation failed. The DASD migration level
2 volume is no longer associated to the key range.

System action
 For the following types of allocation failures, DFSMShsm attempts
to associate and allocate another available DASD migration level 2
migration volume to the key range. 
 The necessary system resources are not available.
The volume is in use by the system.

 If the association and allocation of the new DASD migration
level 2 volume is successful, DFSMShsm attempts to migrate the data set.
If the association and allocation of the new DASD migration level
2 volume is unsuccessful, the migration of the data set fails.
 For
any other type of allocation failure, the migration of the data set
fails. See the related ARC0734I or ARC1001I message. These messages
refer to message ARC1205I.

Programmer response
 When the cause of the allocation failure
is detected and corrected, issue the DELVOL volser MIGRATION(UNASSIGN)
command to mark the DASD migration level 2 volume available for association
to a key range. This allows the volume whose allocation failed to
be selected for association to a key range when some key range needs
a new DASD migration level 2 volume. To reassociate the volume whose
allocation failed to the same key range, issue the DEFINE MIGRATIONLEVEL2
(KEY(k1 k2...) VOLUMES (volser2...) command to
redefine the key ranges and volumes associated to the key ranges.
The position of the volume serial number volser of
the volume whose allocation failed depends on the key range to which
you want the volume associated.  Note: This DEFINE command is just
an example; make sure that the proper keys and volumes for your system
are listed in the command.

Source
 DFSMShsm