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Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
write-through cache A cache management technique for retaining host write requests in read
cache. When the host requests a write operation, the controller writes data
directly to the storage device. This technique allows the controller to
complete some read requests from the cache, greatly improving the response
time to retrieve data. The operation is complete only after the data to be
written is received by the target storage device.
This cache management method may update, invalidate, or delete data from
the cache memory accordingly, to ensure that the cache contains the most
current data.