Verifying the Activity Generated by a LUN

In order to understand the high activity of a disk array, it is important to identify the LUNs (or virtual disks in HP EVA terminology) generating the heaviest I/Os. The array administrator can then check with the system administrator whether the reported activity may be considered a normal behavior.

The Read Byte Rate and Write Byte Rate parameters of the Virtual Disk instances expose the data throughput for each LUN, while parameters such as Cache Read Data Rate, Flush Byte Rate, Mirror Byte Rate, and Prefetch Byte Rate provide more in-depth details about the data traffic associated with each LUN.

LUN Activity

When the system or application that relies on a LUN experiences slow response times, it may become interesting to compare the Read Response Time and Write Response Time parameters of the LUN with different instances of the Virtual Disk class to see whether the LUN actually delivers slower performance than the other LUNs.