Library Control Unit (Lcu); Library Storage Module (Lsm) - StorageTek 4410 Hardware Operator's Manual

System Components

Library Control Unit (LCU)

An LCU is attached to each LSM. When the LCU receives a request from the LMU, the
LCU microprocessor commands the LSM robot to:
1. Move to the location of the cartridge.
2. Make sure that the cartridge is correct by reading the volume serial ID (VOLSER)
label.
3. Retrieve the cartridge from the cell location.
4. Move the cartridge to the specified destination cell.
5. Place the cartridge into the transport, pass-thru port (PTP), cartridge exchange
mechanism (CEM), CAP, or PCAP.

Library Storage Module (LSM)

The LSM is a 12-sided structure that contains a free-standing, vision-assisted robot, and
storage for up to 6,000 cartridges. From one to four 4xxx, 9490, or SD-3 cartridge drives
(2 to 16 transports) can be attached to the exterior of an LSM, allowing the robot to
insert cartridges into the transports. On the 9310, one to four drive cabinets, each
containing 10 or 20 T9840 or T9940 tape drives, can be attached to the exterior of the
LSM in place of cartridge drives. Transports and drive types can also be intermixed within
the same LSM.
page 1-6
1-4
Figure 1-3 on page 1-5
shows a top view of the 9310 LSM.
Eleventh Edition
shows a top view of the 4410 LSM. Figure 1-4 on
9206