HP SW TL881 DLT Mini-Lib/1 Compaq StorageWorks TL881/TL891 Family MiniLibrary - Page 71
Storage Architecture, The Expansion Unit, single-ended Low Voltage Differential LVD SCSI
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2-38 Compaq StorageWorks TL881/TL891 Family MiniLibrary System Reference Guide Storage Architecture The MiniLibrary architecture is uniquely suited and designed for expanding storage needs. The MiniLibrary architecture enables the robotics in each of the MiniLibrary components to exchange cartridges with the PTM, and integrates the robotics in the individual components and the PTM into a single high-performance library robotics system. The MiniLibrary is easily modified, by adding modules and extending the PTM, to adapt to expanding storage needs. You can add drives for faster performance or magazine space for greater capacity, as needed. At power-up, the MiniLibrary updates the system map, signaling the host of the need for expansion. The Expansion Unit The master Expansion Unit integrates the robotics in the individual modules into a single coordinated library robotics system. The Expansion Unit performs and maintains an inventory of all media residing in the system, including bar code data, if the modules are equipped with bar code readers. All necessary system control operations can be performed from the control panel of the Expansion Unit, as well as from the host through software. The SCS interface for the library robotics is designed for high-speed communication with the host, and is available in SCSI-2, Fast SCSI-2, Fast Wide SCSI, single-ended Low Voltage Differential (LVD) SCSI, and High Voltage Differential SCSI-2 configurations. In addition to system control functions, the Expansion Unit has a 16-cartridge magazine with a random access robotic mechanism. The module robotics moves cartridges between the PTM and any of the 16 cartridge storage locations. You can designate a magazine in one of the slave modules as a mail slot for inserting or removing one or more single cartridges, which implements the SCSI IMPORT/EXPORT commands. NOTE: A magazine reserved for import/export service can not be used for data storage.
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