IBM Redbooks ServeRAID-MR10i, User Manual

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7-2 Intelligent Battery Backup Unit Specifications
7.2 Battery Life and Data Retention Time
The MegaRAID
®
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-MR10i Controller.” For optimal performance, replace
the battery pack on the iBBU once a year.
The data retention times shown in Table 7.2 are approximate. They can
vary based on a number of factors, including the following:
•
Capacity of the battery pack and the battery load
•
Ambient temperature
•
Age of the battery and number of discharge cycles it has been through
•
Number of DIMMs installed and number of chips on the DIMMs
•
DRAM size
Memory Technology DDR2 SDRAM (1.8V)
Battery Charge Time ~3 hours
Socket Type N/A
Module Support DDR2
Cache Memory Size Supported 128 MB - 256 MB
Memory Bus Speed 667 MHz
Memory Bus Width Maximum 72-bit
Error Correcting Capability (ECC) N/A
Table 7.1 Specifications
iBBU
Table 7.2 Reference Data Retention Times
iBBU
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 256 Mbytes, using three 64 Mx16 parts DDR2 (low power)
- 72 hours for 128 Mbytes, using three 32 Mx16 DDR2 (low power)