Library mount processing

If a tape volume is inadvertently ejected from a tape library between device allocation and library mount processing, the exit is invoked during library mount processing to let the installation reenter the volume. This exit is only invoked when the tape library fails a mount request because the tape volume is being ejected or cannot be found in the tape library. To prevent the CBR3646D message from being issued, the requested volume must be reentered into the tape library in which it was resident when the tape drive was allocated.

Table 1 lists the contents of the exit input when the volume record does not exist in the TCDB.

Table 1. CBRUXVNL input library mount processing—No TCDB volume record
Parameter	Meaning
UXNVOLSR	Volume serial number
UXNWHERE	3 indicates library mount processing
UXNERROR	1 indicates no volume record in the TCDB
UXNLIB	Library name to which the volume must be re-entered (target)
UXNLDEV	Library device type of the target library
UXNLCON	Library console name of the target library
UXNLTYP	Library logical type of the target library
UXNLDESC	Library description of the target library

Table 2 lists the contents of the exit input when the volume record still exists in the TCDB.

Table 2. CBRUXVNL input library mount processing—Existing TCDB volume record
Parameter	Meaning
UXNVOLSR	Volume serial number
UXNWHERE	3 indicates library mount processing
UXNERROR	4 indicates volume is being ejected 3 indicates volume is in a different library 2 indicates volume is shelf-resident
UXNLIB	Library in which the volume must be re-entered (target)
UXNLDEV	Library device type of the target library
UXNLCON	Library console name of the target library
UXNLTYP	Library logical type of the target library
UXNLDESC	Library description of the target library
UXNLIBRS	Library in which the volume currently resides (might not be the same library as the target resident library)
UXNGROUP	Storage group name
UXNUSEA	Volume use attribute
UXNWPROT	Write protection status
UXNCHKPT	Checkpoint volume indicator
UXNLOC	Volume location code
UXNSHLOC	Shelf location
UXNOWNER	Volume owner information
UXNCREAT	Volume record creation date
UXNENTEJ	Last entry or ejection date
UXNMOUNT	Last mounted date
UXNWRITE	Last written date
UXNEXPIR	Volume expiration date
UXNTDSI	Tape device selection information