Plan for disk write caching
Storage components may use hardware caches to improve read and write performance. Among the storage components that may use a cache are disk arrays, RAID controllers, or the hard disk drives themselves.
If your storage components use caches for disk write operations, ensure that the caches are protected from power fluctuations or power failure. If you do not protect against power fluctuations or failure, data corruption or data loss may occur.
Protection can include the following:
A battery backup unit that supplies power to the cache memory so write operations can continue if power is restored within sufficient time.
An uninterruptible power supply that allows the components to complete their write operations.
If your devices that have caches are not protected, Veritas recommends that you disable the hardware caches. Read and write performance may decline, but you help to avoid data loss.