Avago Technologies Cache Protection for RAID Controller Cards - Manual (Page 135)

Avago Technologies
- 135 -
Cache Backup Products for MegaRAID SAS+SATA RAID Controllers User Guide
May 2015 Chapter 4: Battery Backup Unit and CacheVault Specifications
Battery Life and Data Retention Time
4.3 Battery Life and Data Retention Time
The MegaRAID utilities display a counter showing the number of times a BBU unit has been recharged. When you
replace a BBU unit, you should run the utility program and reset this counter to zero for the new BBU unit.
Avago recommends that you replace the battery pack on the BBU unit once a year or after 500 recharging cycles,
whichever comes first. The warranty on the battery packs is good for one year. The warranty on the CacheVault
modules is three years.
The data retention times shown in the following table are approximate. They can vary based on a number of factors,
including the following factors:
 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 installed DIMMs
 DRAM size
NOTE Battery temperatures kept above 45 °C greatly reduce the life
expectancy of the battery.
Table 18 Reference Data Retention Times
BBU Name Data Retention Times
LSIiBBU01  72 hours for 512 MB, using five 64 Mx16 parts DDR2 (low power)
LSIiBBU05  72 hours for 512 MB, using five 64 Mx16 parts DDR2 (low power)
 72 hours for 256 MB, using five 32 Mx16 parts DDR2 (low power)
 72 hours for 256 MB, using three 64 Mx16 parts DDR2 (low power)
 72 hours for 128 MB, using three 32 Mx16 parts DDR2 (low power)
LSIiBBU06  72 hours for 256 MB, using three 64 Mx16 parts DDR2 (low power)
 72 hours for 128 MB, using three 32 Mx16 parts DDR2 (low power)
LSIiBBU07  72 hours for 512 MB, using five 64 Mx16 parts DDR2 (low power)
 72 hours for 256 MB, using five 32 Mx16 parts DDR2 (low power)
 72 hours for 128 MB, using five 16 Mx16 parts DDR2 (low power)
LSIiBBU08  72 hours for 512 MB, using five 64 Mx16 parts DDR2 (low power)
 72 hours for 256 MB, using five 32 Mx16 parts DDR2 (low power)
 72 hours for 128 MB, using five 16 Mx16 parts DDR2 (low power)
LSIiBBU09  72 hours for 1 GB, using ten 64 Mx16 parts DDR3 (low power)
 72 hours for 512 MB, using five 64 Mx16 parts DDR3 (low power))
LSIiTBBU03  72 hours for 512 MB, using five 64 Mx16 parts DDR2 (low power)
 72 hours for 256 MB, using five 32 Mx16 parts DDR2 (low power)
CVFM01 NA
CVFM02 NA
CVFM03 NA
CVFM04 NA