HP P6000 manual HP EVA storage array, HP EVA storage controller, HP EVA virtual disk

The following identifying information is common to several objects:

•Ctlr—The controller for which metrics are being reported. This field shows the last four digits of the controller serial number.

•Node—The array from which data has been collected.

•GroupID—The disk group to which the virtual or physical disk belongs.

Not all metrics that are available in the command line interface are available in Windows Performance Monitor.

HP EVA storage array

The HP EVA storage array object provides information about the total workload on the array.

The counters are:

•Total Host Req/s—The total number (per second) of host-initiated read and write requests to the controller pair.

•Total Host MB/s—The total rate (per second) at which data is read from and written to the disk by the controller pair.

HP EVA storage controller

The HP EVA storage controller object provides information about controller processor and host data transfer utilizations.

The counters are:

•% Processor Time—The percentage of time that the central processing unit on the controller is active. A completely idle controller shows 0%. A controller saturated with activity shows 100%.

•% Data Transfer Time—Similar to % Processor Time except that it does not include time for internal processes not related to host-initiated data transfers. For example, it does not include time for sparing, leveling, snapclones, snapshots, replication traffic, virtual disk management, or communication with other applications. The value is always equal to or less than the % Processor Time counter and the difference is the amount of processor time engaged in non-data transfer activity.

HP EVA virtual disk

The virtual disk object provides information about workload and performance for each virtual disk on the array. Activity is reported separately for each controller accessing a virtual disk. The total activity for each virtual disk is the sum of the reported activity for each controller. A virtual disk may also be a snapshot, snapclone, or a DR group member. In the output, logical unit number (LUN) is used interchangeably with virtual disk.

Virtual disks must be presented to a host to be seen by HP P6000 Performance Data Collector. However, replication volumes on the replication system are visible without being presented. HP P6000 Performance Data Collector also shows DR group membership with the virtual disk table in the DRM Group column.

If the array controllers are active/standby, all activity to a virtual disk is through the active controller. If the array controllers are active/active, one controller is preferred (the owning controller) but requests can still be processed by the other controller (the proxy controller). In active/active controllers, all host requests are logged by the receiving controller only, whether owning or proxy. Thus, all request rate and data rate activity for a virtual disk is the sum of both controllers.

88 Monitoring array performance using HP P6000 Performance Data Collector