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Mean time between failures, Table 10, Reliability – Quantum Tape Drive LTO-3 User Manual

Page 60

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Chapter 5 Specifications
Mean Time Between Failures

46

LTO-3 Tape Drive User’s Guide

Table 10 Reliability

Mean Time Between Failures

5

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 desktop drive power supply is 50,000 hours with the

unit operated at full load and 25°C.

Specification

Description

Non-recoverable error

rate

Less than 1 in 10

17

bits

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

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

25°C)

Cartridge load/

unload

300,000 cartridge load/unload cycles (no

thread)

Mean time to replace

(MTTR)

Less than 30 minutes

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.