Quantum LTO-3 manual Mean Time Between Failures, Specification Description

Chapter 5	Specifications
Mean Time Between Failures
Table 10	Reliability	Specification	Description
		Non-recoverable error	Less than 1 in 1017 bits
		rate
		Error recovery and	• Error correction code techniques
		control	(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/	300,000 cartridge load/unload cycles (no
		unload	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% 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.

46 LTO-3 Tape Drive User’s Guide