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device and only works as a slave to the expansion unit. To create a
multimodule rackmount system, there must be one expansion unit and
at least one base unit. The expansion unit has to be the top module
in the configuration.
The expansion unit works with either the TL881 or TL891 base unit.
• TL881 or TL891 base unit — includes library robotics, bar code reader, a
removable 10-cartridge magazine, and one or two tape drives:
– TL881 — DLT 20/40 (TZ88N-AV) drives
– TL891 — DLT 35/70 (TZ89N-AV) drives
To participate in a MiniLibrary configuration, each base unit must be
set up as a slave unit to pass control to the expansion unit. Once the
expansion unit has control over the base unit, the expansion unit controls
tape-cartridge movement between the magazines and tape drives.
_____________________ Note _____________________
You cannot mix TL881 and TL891 base units in a rackmount
configuration as the tape drives use different formats.
• 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.
8.11.1.3 TL881 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 8–10 shows the capacity and performance of a
8–50 Configuring a Shared SCSI Bus for Tape Drive Use