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Table 6-5
lists the environmental specifications of the PowerVault LTO-4-120 Half-Height tape drive.
Table 6-5. Environmental Requirements
Specification
Operational
Airflow requirements
Internal: 6 CFM (front to back)
Altitude
-50 feet to 10,000 feet
Humidity gradient
10% per hour
Relative humidity
20% to 80% non-condensing
Shock (1/2 sine wave)
31G +/- 5%, 2.6 ms
Temperature
+50° to +140° F
(+10° to + 60° C)
Thermal gradient
10° C per hour over temp. range
Vibration (sweep test)
0.005 inches DA (5-43 Hz)
0.50 G peak (43-1000 Hz) sweep rate 5-1000Hz; 1.0 octave per minute
Injected Noise Specifications
The LTO-4-120 Half-Height tape drive operates without degradation of error rates with 100 mV of noise injected between the chassis and 0 V at the power
connector at any frequency between 45 Hz and 20 MHz.
Reliability Specifications
The PowerVault LTO-4-120 Half-Height tape drive is designed for maximum reliability and data integrity.
Table 6-6. Reliability Specifications
Specification
Cartridge load/eject
Error recovery and control
Mean time between failures (MTBF)at 100% duty cycle with power applied and tape moving
continuously
Mean time to replace (MTTR)
Nonrecoverable error rate
Mean Time Between Failures
The mean time between failures (MTBF) 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.
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 replacement drive.
The MTTR for LTO products is less than 0.5 hour (30 minutes).
The LTO drives are field-replaceable units. If a problem occurs with a subassembly or component in the drive, you should replace the entire unit. Return the
drive to the factory in its original packaging. Contact your distributor, dealer, or computer system company, or the relevant representative to arrange the
return.
LTO Cartridge Specifications
Environmental Considerations
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Nonoperational
N/A
-50 feet to 35,000 feet
10% per hour
5% to 95% non-condensing
71G +/- 5%, 2.0 ms
-40° to +149° F
(-40° to + 65° C)
20° C per hour over temp. range
0.1 inches (5--15Hz)
1.0 G (15-500 Hz)
1.0 octave per minute
Table 6-6
lists the reliability specifications.
Description
100,000 cartridge load/eject cycles (no thread)
Error correction code techniques
l
(C1 and C2 ECC)
Read-after-write (RAW)
l
Error monitoring and reporting (error log)
l
Retry on
l
250,000 hours
Less than 30 minutes
1 7
Less than 1 in 10
bits