Fujitsu MPB3052AT User Manual download pdf (Page 24)

C141-E045-02EN 1 - 9

1.6 Shock and Vibration

Table 1.6 lists the shock and vibration specification.

Table 1.6 Shock and vibration specification

Vibration (swept sine, one octave per minute)

• Operating

• Non-operating

5 to 300 Hz, 0.5G-0-peak

(without non-recovered errors)

5 to 400 Hz, 4G-0-peak (no damage)

Shock (half-sine pulse, 11 ms duration)

• Operating

• Non-operating

10G (without non-recovered errors)

75G (no damage)

1.7 Reliability

(1) Mean time between failures (MTBF)

The mean time between failures (MTBF) is 500,000 H or more (operation: 24 hours/day, 7

days/week).

This does not include failures occurring during the first three months after installation.

MTBF is defined as follows:

MTBF= (H)

"Disk drive defects" refers to defects that involve repair, readjustment, or replacement. Disk

drive defects do not include failures caused by external factors, such as damage caused by

handling, inappropriate operating environments, defects in the power supply host system, or

interface cable.

(2) Mean time to repair (MTTR)

The mean time to repair (MTTR) is 30 minutes or less, if repaired by a specialist maintenance

staff member.

(3) Service life

In situations where management and handling are correct, the disk drive requires no overhaul

for five years when the DE surface temperature is less than 48°C. When the DE surface

temperature exceeds 48°C, the disk drives requires no overhaul for five years or 20,000 hours

of operation, whichever occurs first. Refer to item (3) in Subsection 3.2 for the measurement

point of the DE surface temperature.

Total operation time in all fields

number of device failure in all fields

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 179 180

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Fujitsu MPB3052AT User Manual Page 24