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7.2
Battery Life and Data Retention Time
Table 7.2
Reference Data Retention Times
7-2
Table 7.1
Intelligent Battery Backup Unit Specifications
Battery Fast Charge Time
Socket Type
Module Support
Cache Memory Size Supported
Memory Bus Speed
Memory Bus Width
Error Correcting Capability (ECC)
Auxiliary
The RAID configuration utilities display a counter showing the number of
times the iBBU has been recharged. When you install a new iBBU, the
battery recharge cycle counter for the iBBU is automatically set to zero.
For instructions on installing the iBBU, see
iBBU on the ServeRAID M5025 Controller."
For optimal performance, replace the battery backup unit once a year.
The data retention time shown in
vary based on a number of factors, including the following:
Capacity of the battery pack and the battery load
Ambient temperature
Battery age and the number of discharge cycles
Number of DIMMs installed and the number of chips on the DIMMs
DRAM size
BBU
Name
Data Retention Times
iBBU
- 72 hours for 512 Mbytes, using five 64 Mx16 parts DDR2 (low power)
- 72 hours for 256 Mbytes, using five 32 Mx16 parts DDR2 (low power)
- 72 hours for 128 Mbytes, using five 16 Mx16 parts DDR2 (low power)
Intelligent Battery Backup Unit Specifications
iBBU
~6 hours
N/A
DDR2
128 MB - 512 MB
667 MHz
Maximum 72 bit
N/A
Yes
Section 5.1, "Installing the
Table 7.2
is approximate. They can
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