Quantum LTO-2 manual Mean Time Between Failures, Specification Description

		Chapter 5 Specifications
		Mean Time Between Failures
Table 9 Reliability	Specification	Description
	Non-recoverable error rate	< 1 in 1017 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	250,000 hours MTBF at 100% duty cycle:
	failures (MTBF)	power applied and tape moving
		continuously
		(Desktop drive; 50,000 hours at full load
		and 25°C)
	Cartridge load/unload	100,000 cartridge load/unload cycles (no
		thread)
	Mean time to replace	Less than 30 minutes
	(MTTR)

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 percent 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.

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.

LTO-2 Half-Height Tape Drive User’s Guide 43