Compaq AA-RHGWC-TE manual 12.1.3 TL881 and TL891 Rackmount Scalability

•Data unit — This rackmount module contains a 16-cartridge magazine to provide additional capacity in a multi-module configuration. The data unit robotics works in conjunction with the robotics of the expansion unit and base units. It is under control of the expansion unit.

The data unit works with either the TL881 or TL891 base unit.

•Pass through mechanism — The pass-through mechanism is attached to the back of the expansion unit and each of the other modules and allows the transfer of tape cartridges between the various modules. It is controlled by the expansion unit.

For each base or data unit added to a configuration, the pass-through mechanism must be extended by seven inches (the height of each module). A seven-inch gap may be left between modules (providing there is sufficient space), but additional pass-through mechanism extensions must be used.

8.12.1.3TL881 and TL891 Rackmount Scalability

The rackmount version of the TL881 and TL891 MiniLibraries provides a scalable tape library system that you can configure for maximum performance, maximum capacity, or various combinations between the extremes.

Either library uses DLT IV tape cartridges but can also use DLT III or DLT IIIxt tape cartridges. Table 8–17 shows the capacity and performance of a TL881 or TL891 MiniLibrary in configurations set up for either maximum performance or maximum capacity.

Configuring a Shared SCSI Bus for Tape Drive Use 8–59