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Clariion Cache: Read and Write Caching


The following blog explains how Read and Write Cache functions within Clariion.

Clariion Read Caching

The Diagram on the left explains Read Caching (Only One SP involved in this process)

Step A: The host is requesting data from the active path to the Clariion.

Step B: If the data is in Cache, the data is sent over to the host.

Step Aa: This step comes into picture if the requested data is not in cache and is now requested from the Disk.

Step Ab: The Disk reads the data in the cache and Step B is performed completing the request.



Clariion Write Caching

The Diagram on the right explains Write Caching (Both the SP’s are involved in this process)

Step A: The host writes data to the disk (lun) through the active path between Host and Clariion. The data is written in cache.

Step B: The Data from above is in Cache (example SPA) is now copied over to the Cache of SPB using the Clariion Messaging Interface (CMI)

Step C: At this point an acknowledgement is sent to the host that the Write is now complete.

Step D: Using the Cache flushing techniques the data is written to the Clariion Disk (lun)