Cache power-off protection solution of RAID controller card


Intelligent battery backup units (iBBUs) or supercapacitors (recommended) can be used to improve cache data security of servers.
? iBBU:
If a server is powered off unexpectedly, data will be stored in the DDR.
The iBBU provides power to the DDR to ensure normal operation.
The data protection time is generally 48 to 72 hours.
The iBBUs require charging and discharging. This may affect the server performance for 4 to 9 hours.
An iBBU needs to be replaced every one to two years.
? Supercapacitor:
When a power failure occurs, the supercapacitor provides power to the RAID controller card, DDR, and trans flash module (TFM), ensuring data is migrated from the DDR to the TFM.
After the data is migrated to the TFM, the supercapacitor no longer needs to provide power to the cache.
It takes little time to charge and discharge a supercapacitor, with no impact on system performance.
A supercapacitor will last as long as the server.

Other related questions:
Method of checking the RAID controller card cache
To view the cache of the RAID controller card (such as LSISAS2208), access the webBIOS and view RAID controller card (adapter) properties. Some RAID controller cards do not support this function.

RAID controller card
For details about RAID controller cards supported by Huawei servers, enter a product model + RAID controller card; for example, RH2288 V3 RAID controller card.

Necessity of configuring RAID arrays for a RAID controller card
If the LSISAS1078, LSISAS2208, or LSISAS3108 RAID controller card is used, the disks can be recognized by the system only when they are in RAID arrays. If the LSISAS1068, LSISAS2308, or LSISAS3008 RAID controller card is used, the disks can be used as individual disks for OS installation, if they are not in RAID arrays.

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