StorageTek manual Shared Library Data Sets, 12VM/HSC 6.0 System Programmer’s Guide

VM/XA HOST		VM/SP HOST	MVS HOST
			MVS/XA
ACS	MVS/XA	ACS	(JES2 OR JES3)
SERVICE		SERVICE
MACHINE	GUEST	MACHINE

JOURNAL JOURNAL JOURNAL JOURNAL

PRIMARY	SECONDARY
CONTROL	CONTROL
DATASET	DATASET

STANDBY

CONTROL

DATASET

C29335

Figure 3. Shared Library Data Sets

Automated cartridge mounts/dismounts are performed in response to calls to the tape management interface. The HSC determines that a mount/dismount is required for a volume under automated library control (cartridge resides in an LSM storage cell), and it communicates with the appropriate LMU.

If the request is for a mount, the following information is communicated to the LMU:

•the LSM and panel/row/column in which the volume resides

•the destination LSM (where the volume is to be mounted on a transport).

If all drives in an LSM are busy, a cartridge can be moved to another LSM to satisfy the mount request. This action is performed without operator intervention, since the pass-thru port (PTP) makes the cartridge available to the attached LSM.

If the request is for a dismount, this information is passed to the LMU:

•the LSM, cartridge drive, and transport in which the volume resides

•the destination (storage cell, CAP, or PTP) of the cartridge.

12VM/HSC 6.0 System Programmer’s Guide

1st ed., 6/30/04 - 312579601