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TL891 MiniLibrary System User's Guide
Compaq Confidential – Need to Know Required
Writer: Everett Godaire Project: TL891 MiniLibrary System User's Guide Comments:
Part Number: ER-TL891-UA.A01 File Name: b-ch1 Introduction Last Saved On: 3/1/99 4:07 PM
Advanced Design Features
The MiniLibrary System incorporates many significant improvements in tape
drive and library design. One of the most important is the use of highly
reliable DLT technology, with media rated by the media manufacturer at better
than 1,000,000 head passes.
Embedded Diagnostics
The MiniLibrary System and each of its modules provide three levels of
embedded diagnostics. The Power-On Self Test (POST) performs various
verification tests on the system’s configuration and host interface and device
control functions, as well as memory tests, at power-up. The second level of
diagnostics is the User Diagnostics, which provide for displaying and
changing configuration options. The third level, Customer Engineer (CE)
Diagnostics, include advanced diagnostics to be used by Customer Engineers
for servicing the MiniLibrary System. Both the User Diagnostics and the CE
Diagnostics may be selected from the front panel.
User Diagnostics are described in greater detail in Chapter 3, Installation.
Error Checking
Drives used in the MiniLibrary System apply a 16-bit parity check to each
record, a 64-bit CRC to each 4 kb of data, and Reed-Solomon error correction
code overall. In addition, there is an internal parity check on the data buffer.
Compression
MiniLibrary System drives use the standard Digital Lempel-Ziv (DLZ) data
compression algorithm.
Capacity
A Base Module with its 10-cartridge magazine and a single Expansion unit
with its 16-cartridge magazine offers the formatted capacities shown in Table
1-1.