HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Maintenance and Service Guide (EK-G80MS-SA. C01, March 2005)

Glossary
276 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
write-through cache
A cache management technique for retaining host write requests in read cache. When the host
requests a write operation, the array controller writes data directly to the storage device. This
technique allows the array 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.
write-through caching
A cache management method used to decrease subsystem response time to a read. This method
allows the array controller to satisfy the request from the cache memory rather than from the
disk drives.