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Chapter 2. Host Software Component Functions 33
1st ed., 6/30/04 - 312579601
Mount/Dismount Functions
Mount and dismount functions consist of the following processing:
• mounting specific volumes
• mounting scratch volumes
• dismounting library volumes
• handling abnormal mounts and dismounts
• virtual thumbwheel (VTW)
• automated tape transport cleaning.
The mount/dismount component receives the request sent by the tape management
interface component and makes the mount/dismount of cartridges occur.
Each mount/dismount function is described in this section.
Several options exist to allow users to specify how they want mount/dismount to react in
various situations. Refer to the ‘‘MNTD (Mount/Dismount Options) Command and
Control Statement’’ in the HSC Operator’s Guide for a description of these options.
Mount Processing for Specific Volumes
The HSC determines when a library volume is to be mounted on a library-controlled
transport. It maintains a record of the library location for each cartridge and instructs the
LMU to mount the requested cartridge on the selected transport.
Mount processing occurs as a result of:
• the tape management system (TMS) interpreting a request for library transports
• issuance of the HSC operator Mount command
• change of the HSC from base service level to full service level
• startup of an HSC subsystem
• a clean request.
A volume may be temporarily or permanently entered into the library to satisfy a mount on
a library transport. If a volume is temporarily entered into an LSM, a notation is made in
the library control data set for this volume to be automatically ejected, via a CAP, when
the volume is dismounted.