The server ends a client retrieval or restore operation for the specified session because a needed storage pool volume has been varied offline or the storage pool is unavailable.
The server ends the specified session and server operation continues.
Use the VARY ONLINE command to vary offline storage volumes online in the storage hierarchy and make them available to client nodes for file storage. If all volumes are online, check the ACCESS parameter of the storage pool. If the access mode is UNAVAILABLE, use the UPDATE STGPOOL command to update it to READONLY or READWRITE.