RAID controller cards temporarily store data from the host system in a cache until it is successfully written to the storage medium. While the data is in the cache, it can be lost in the event of a power failure, jeopardizing the permanent integrity of the data.

RAID caching is a cost-effective way to improve I/O performance by writing data to the controller's cache first before it reaches the hard drive. However, in the event of a power or server failure, write operations in the cache may be lost.

The CacheVault flash cache protection modules and battery backup units protect the integrity of cached data by storing it in non-volatile flash cache memory or providing battery power to the controller.

CacheVault technology prevents data loss by supplying critical components of the card with power long enough to automatically transfer the cached data to NAND flash. Once power is restored, the data is loaded back into the cache, and normal operation resumes. By using a supercapacitor instead of lithium-ion batteries, CacheVault technology virtually eliminates the hardware maintenance costs associated with batteries, reduces overall costs over the lifespan of the controller card, and provides a more environmentally friendly cache protection while maintaining optimal RAID performance.