EonStor DS S48 Series Hardware Manual
5.3
Replacing / upgrading the CBM for RAID Models
For single controller models, upgradeable components are listed below:
Battery Backup Unit (BBU)
: In the event of a power failure, the BBU can
help store/ save cached data in the DRAM module for up to 72 hours.
Battery Backup Unit (BBU) + Flash Backup Module (FBM)
: In the event
of a power failure, the combination of BBU+FBM (non-volatile flash storage)
can store the data, indefinitely.
WARNING
Make sure you have the replacement module(s) in your hand before you attempt to
replace the CBM.
Observe all BBU Warnings and Precautions mentioned in the
The CBM consists of a battery backup unit (BBU) and flash backup module (FBM).
The CBM can sustain and transfer cached data to a flash backup module in the event
of a power outage or in the unlikely event of both PSUs failing.
The CBM (BBU and FBM) might be optional items depending on the system model
(refer to
Cache Backup Module (CBM) of RAID Controllers
).
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