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Chapter 1 Overview
Read this chapter if you use the Additional DAC Battery (called BBU below) for the first time.
This chapter describes the characteristics and configuration of the BBU, and outlines the additional battery
installation job.
1. BBU Characteristics
The BBU is an additional battery exclusively used for the Disk Array Controller (SAS).
Connecting the BBU to the disk array controller can prevent data from being lost due to an unforeseen
accident, including instantaneous power interruption (in the WriteBack mode).
Backup (up to 72 hours ) of the data in the disk array controller cache memory.
Improvement of reliability in WriteBack mode.
Use of rechargeable NiMH battery.
2. Specifications
Item
Maximum data backup time
Outer dimension (mm)
Weight
Battery capacity
Operating
Temperature
environment
Humidity
Storage
Temperature
environment
Humidity
Life (battery back)
Specifications
72 hours
39 (width) × 133 (depth) × 9 (height)
About 0.10 kg
4.22 Wh
10°C - 35°C
20% - 80%
0°C - 35°C
20% - 80%
About 2 years
Remarks
Full charge
Normal operation
Without condensation
Without condensation
Varies depending on the
operating environment and
the boundary conditions
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