Monitoring the Efficiency of the Caching Mechanism

Each controller in an EMC disk array can be configured to use a specified amount of memory to cache the read and/or write operations. The solution reports the amount of memory configured by each controller for the read and write operations.

The Write Flush Byte Rate represents the rate in MB/s at which data is committed to the disk (i.e. physically written). This value is to be compared with the Write Byte Rate of the disk array.

Comparing Write Flush Byte Rate with Write Byte Rate

The Cache Dirty Pages Percentage parameter represents the amount in percentage of the write cache that has been modified by host write operations and not yet flushed to the disks. Reaching 100% means that write case is too small and cannot handle the flow of write operations.

Checking the Cache Dirty Pages Percentage