Acer DAC960PG Benutzerhandbuch

Battery Backup Unit Option

Manual No. 775012

A-7

 

Whenever the system is running, the BBU is standing by, monitoring the 
voltage level of VCC. In the event of a power failure, the VCC voltage level 
will begin to drop. When the BBU detects this voltage drop, it checks the 
status of the disk cache. If the cache is empty, the BBU does nothing. 

If the cache contains data during a power failure, the BBU will maintain 
cache data integrity until the power is restored. When power is restored and 
the system finishes the bootstrap process, the cache contents will be written 
to the disk array. The cache contents will then be flushed from the cache.

The status of the battery can be checked with the gas gauge feature that can 
be accessed in GAM (version 2.1x or greater). The gas gauge appears on the 
screen as two meters, a battery power meter and a charge level meter, each 
calibrated from 0 to 100. 

The battery power meter indicates the battery capacity in hours. It will 
indicate a charge duration of up to 100 hours. The firmware will detect the 
Mylex supplied SIMM and assign a value based upon the charge level of the 
battery and the power consumption rate of the SIMM.

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Do not use SIMMs which are not supplied by Mylex.

The charge level meter displays the charge state of the battery expressed in 
percent (100% indicates a fully charged battery). 

When the meter on the right indicates the battery is fully charged, the meter 
on the left will indicate the maximum time in hours that the battery can be 
expected to maintain cache data integrity. This value will vary depending 
upon which Mylex supplied SIMM is being used (see Table A-1).

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When the charge level is 100%, the current number of 
hours and maximum number of hours (printed out 
below the left dial) will be equal.