StorageTek Host Software Component 6 User Manual

1st ed., 6/30/04 - 312579601

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. 

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.