IBM Redbooks ServeRAID-MR10M, User Manual

Page: 76 / 88

7-2 Intelligent Battery Backup Unit Specifications
7.2 Battery Life and Data Retention Time
The MegaRAID 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
Section 5.1,
“Installing the iBBU on the ServeRAID-MR10M Controller.”
For optimal performance, replace the battery backup unit once a year.
The data retention time shown in Table 7.2 is approximate. They can
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
Battery Fast Charge Time ~3 hours
Socket Type N/A
Module Support DDR2
Cache Memory Size Supported 128 MB - 512 MB
Memory Bus Speed 667 MHz
Memory Bus Width Maximum 72 bit
Error Correcting Capability (ECC) N/A
Auxiliary Yes
Table 7.1 Intelligent Battery Backup Unit Specifications
iBBU
Table 7.2 Reference Data Retention Times
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)