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Chapter 5 Specifications

Reliability Specifications

50 LTO-4 (Model B) Half-Height Tape Drive User’s Guide

Table 8 Reliability

Specifications

Mean Time Between

Failures

The mean time between failures (MTBF) for the internal drive is specified

at 250,000 hours minimum. This specification includes all power-on and

operational time but excludes maintenance periods. Operational time is

assumed to be 100% of the power-on time. Operational time is the time

the tape is loaded.

The MTBF for the tabletop drive power supply is 50,000 hours with the

unit operated at full load and 25°C.

Note: The MTBF rating does not represent any particular drive, but is

derived from a large database of test samples. Actual rates may

vary from unit to unit.

Mean Time to Replace The mean time to replace (MTTR) is the average time required by a

qualified service technician to diagnose a defective drive and to install a

Specification Description

Cartridge load/eject 50,000 cartridge load/eject cycles (no thread)

Error recovery and

control

• Error correction code techniques

(C1 and C2 ECC)

• Read-after-write (RAW)

• Error monitoring and reporting (error log)

•Retry on

Mean time between

failures (MTBF)

250,000 hours MTBF at 100% duty cycle:

power applied and tape moving

continuously

(tabletop drive; 50,000 hours at full load and

25°C)

Mean time to replace

(MTTR)

Less than 30 minutes

Nonrecoverable error

rate

Less than 1 in 10

bits

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Quantum LTO 4 Betriebsanweisung Seite 66