NEC BBU User Manual

Contents

NEC BBU User Manual Manual pdf 15 page image

Chapter 1 OverviewRead 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 batteryinstallation job.1. BBU CharacteristicsThe 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 unforeseenaccident, 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. SpecificationsItem Specifications RemarksMaximum data backup time 72 hours Full chargeOuter dimension (mm) 39 (width) × 133 (depth) × 9 (height)Weight About 0.10 kgBattery capacity 4.22 Wh Normal operationTemperature 10°C - 35°COperatingenvironment Humidity 20% - 80% Without condensationTemperature 0°C - 35°CStorageenvironment Humidity 20% - 80% Without condensationLife (battery back) About 2 years Varies depending on theoperating environment andthe boundary conditions