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8.12.1.2 TL881 and TL891 MiniLibrary Rackmount Components
A TL881 or TL891 base unit (which contains the tape drive(s)) can operate
as an independent, standalone unit, or in concert with an expansion unit
and multiple data units.
A rackmount multiple-module configuration is expandable to up to six
modules in a configuration. The configuration must contain at least one
expansion unit and one base unit. The TL881 and TL891 DLT MiniLibraries
may include various combinations of:
• MiniLibrary Expansion unit — the MiniLibrary expansion unit enables
multiple TL881 or TL891 modules to share data cartridges and work as a
single virtual library. The expansion unit also includes a 16-cartridge
magazine.
The expansion unit integrates the robotics in the individual modules into
a single coordinated library robotics system. The expansion unit assumes
control of the media, maintaining an inventory of all media present in
the system, and controls movement of all media. The tape cartridges can
move freely between the expansion unit and any of the base units or data
units via the system’s robotically controlled pass-through mechanism.
The expansion unit can control up to five additional attached modules
(base units and data units) to create a multimodule rackmount
configuration. The expansion unit must be enabled to control the base
unit by setting the base unit to slave mode. The data unit is a passive
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 because the tape drives use different formats.
8–58 Configuring a Shared SCSI Bus for Tape Drive Use