CH A P T E R 4
Library Operation
The library has three modes of operation, automated, manual, and maintenance. These modes are defined and explained in the following sections.
Automated Mode of Operation
The automated mode of operation is active when a library system or library complex is automatically mounting/dismounting cartridges without physical intervention by a person.
General automated library operations consist of the following activities:
■“Mounting and Dismounting of Cartridges” on page 45
■“Performing CAP Activities” on page 46
■“Using CAPS in a Partitioned Library” on page 53
■“Monitoring Library Events” on page 57
■“Monitoring PTPs” on page 58
■“Cleaning of Drives” on page 58
Mounting and Dismounting of Cartridges
The central function of the library or library complex is the automated mounting and dismounting of cartridges. Host mount/dismount commands are accepted by the library’s central processor and translated into robotic commands that are performed by the robots.
Mount Sequence
A simplified mount sequence involves the following steps:
1.A host requests that a specific volume serial number (VOLID) for a cartridge be mounted in a drive.
2.The library transmits to the host that the VOLID is located within the library and a drive is available to satisfy the mount request.
3.The library assumes responsibility for the mount.
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