Method of checking the RAID controller card cache

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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.

Other related questions:
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.

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.

Method used to check storage cache
You can run the showcontroller command on the CLI to check the cache of T series V100R005 storage systems. For V3 series storage systems, run the show controller general command to check the cache. In the command output, you can obtain related information from the electronic label. Note: The sum of the two controller memory sizes is the storage cache size.

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