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Write-back is a cache-writing strategy in which the controller receives
the data to be written to disk, stores it in the memory buffer, and immediately
sends the host operating environment a signal that the write operation
is complete, without waiting until the data is actually written to the
disk drive. Write-back caching improves the performance of write operations
and the throughput of the controller card. Write-through is a cache-writing
strategy in which the controller writes the data to the disk drive before
signaling the host operating environment that the process is complete.
Write-through has lower write operation and is considered more secure
if power failure should occur. Because a battery module is installed,
power is supplied to the data cached in memory and the cached writes can
be completed when power is restored. |