HP SW TL881 DLT Mini-Lib/1 Compaq StorageWorks TL881/TL891 Family MiniLibrary - Page 73
Internal Cabling Configuration, Bus Length Limitations, Physical Configuration, System Expansion
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2-40 Compaq StorageWorks TL881/TL891 Family MiniLibrary System Reference Guide Internal Cabling Configuration The differential MiniLibrary system is wired in an independent-bus SCSI configuration; the robotics and each of the drives has its own SCSI bus. SCSI jumpers are available for those applications requiring that some combination of drives and robotics are daisy-chained to a single SCSI bus. The single-ended table-top unit has the robotics and first DLT drive daisy- chained internally to shorten the total internal cable length. The second drive is on an independent bus. Bus Length Limitations The single-ended SCSI-2 bus is limited to 19 ft (6 m) in length; single-ended fast SCSI-2 bus is limited to 10 ft (3 m) overall length. LVD SCSI bus length is 39 ft (12 m). In contrast, differential SCSI-2 and fast SCSI-2 buses can be up to 82 ft (25 m) long. Physical Configuration All modules in a MiniLibrary system must be mounted in a rack except for the table top module version. When a system is ordered, all the modules are supplied in a rack-mount configuration. Modules cannot be operated alone except for the MiniLibrary Base Module, which can be converted to operate as a free-standing 10-slot library. System Expansion A DLT MiniLibrary system can be expanded in capacity or performance or both by adding or removing components. Associated with each component is a section of the PTM. The MiniLibrary storage system firmware integrates the robotics in the individual modules and the Expansion Unit PTM into a single high-performance library robotics system. Free-Standing MiniLibrary Base Modules Conversion You can add existing MiniLibrary Base Modules to your system by changing firmware, resetting internal jumpers, removing the pass-through cover plate, and in some cases converting from desktop to rackmount. These tasks should be performed by qualified service personnel. Contact your technical support representative for instructions.