When using the write-cache-mode option, you can choose from two available settings.
For the write-back setting, the operating system sends data to the controller to write to a storage device. Subsequently, the controller sends a confirmation to the operating system before actually writing the data to the storage device. Doing so increases performance, but also contains an element of risk. For example, if there is a power failure, the data currently in the controller cache is lost. This is no risk when using a controller with a battery-backup cache. The battery preserves the data in the controller cache in the event of a power failure.
For the write-through setting, the operating system sends data to the controller to write to a storage device. Subsequently, the controller writes the data to the storage device; then, sends a confirmation to the operating system. This setting can decrease performance, but contains no risk of losing data.
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