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B-6 Flash-based Backup Capacity
The FBM backup capacity is defined as the maximum duration of a power failure for which data in the cache
memory can be written into the flash on AC-SAN-1883FBM. The FBM can support up to 2GB memory chips that
installed on the 12Gb/s SAS RAID controller.
B-7 Operation
There are no manual procedures for FBM conditioning or preconditioning to be performed by the user. No further
power is required once the super capacitor is fully charged.
Note: Do not remove FBM while system is running.
B-8 FBM Functionality Test Procedure:
1. Writing amount of data into controller volume, about 5GB or bigger.
2. Waiting for few seconds, power failed system by remove the power cable.
3. Power on system, and press Tab/F6 to login controller.
4. Check the controller event log, make sure the event shows "Power On With Battery Backup".
B-9 FBM Specifications
Mechanical
Module Dimension (W x H x D): with battery: 64.4 x 16.97 x 127 mm; with supercap: 64.4 x 18.72 x 127 mm
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BBM Connector: (1*14) box header
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Environmental
Operating Temperature: 0°C to +50°C
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Typical Life Expectancy: 5 years at 50°C
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Cache Memory Size Supported: up to 2GB (super capacitor/battery) or 8GB (battery)
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Appendix C
Battery Backup Module (AC-SAN-1883BBM)
C-1 Overview
The 12Gb/s SAS RAID controller operates using cache memory. The Battery Backup Module is an add-on module
that provides power to the 12Gb/s SAS RAID controller cache memory in the event of a power failure. The Battery
Backup Module monitors the write back cache on the 12Gb/s SAS RAID controller, and provides power to the cache
memory if it contains data not yet written to the hard drives when power failure occurs.
C-2 BBM Components
This section provides the board layout and connector/jumper for the BBM.
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