Function

The back-end transfer can be monitored. The back-end transfer is the number of data transfers between the cache memory and the data drive. The graph contains following information.

• Cache to Drive

  The number of data transfers from the cache memory to data drives.

• Drive to Cache Sequential

  The number of data transfers from data drives to the cache memory in sequential access mode

• Drive to Cache Random

  The number of data transfers from data drives to the cache memory in random access mode

Storing period

Sample Interval can be specified from 1 to 15 minutes.

Selection of monitoring objects

Select the desired monitoring objects in the Performance Objects field.

Item on left side of Object field	Item on right side of Object field	Item on left side of Monitor Data field	Item on right side of Monitor Data field
Logical Device*	Base	Back Trans. (count/sec)	Total
			Cache to Drive
			Drive to Cache (Sequential)
			Drive to Cache (Random)
Parity Group*	None	Back Trans. (count/sec)	Total
			Cache to Drive
			Drive to Cache (Sequential)
			Drive to Cache (Random)
LUN*	Base	Back Trans. (count/sec)	Total
			Cache to Drive
			Drive to Cache (Sequential)
			Drive to Cache (Random)
* Volumes that do not accept I/O from the host, such as pool-VOLs, are not monitored.