EVA Physical Disk Traffic Test

This test monitors the level of traffic on each physical disk on an EVA storage array, and helps isolate irregularities in load balancing across the disks. Alongside, the test also helps identify which disk is experiencing bottlenecks (if any).

Target of the test : An EVA Storage Array

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each physical disk on the EVA storage array.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.

Host

The host for which the test is to be configured.

Port

Refers to the port used by the EVA SAN device.  By default, it is null.

EvaPerfLocation

Specify the full path of the directory in which the evaperf.exe has been installed.

ArrayName

Specify the name of the EVA SAN array that has been configured for monitoring.

SSSULocation

This test uses the EVAPerf software component to auto-discover the device ports on an EVA storage array. The EVA Controller to Device Port Status test on the other hand uses the SSSU console to discover device ports. During auto-discovery, the EVAPerf utility reports the WWN names of the device ports. In contrast, the SSSU console reports the friendly names of the same device ports.

To ensure that device port references are uniform and consistent across tests, you can optionally configure this test to use the SSSU console (instead of EVAPerf) to perform device port discovery. This way, the names of device ports will be the same for this test and the EVA Controller to Device Port Status test. To enable device port discovery via the SSSU console, configure the full path to the location of the SSSU.exe in the SSSULocation text box. If you prefer not to use SSSU.exe for discovering device ports and would rather use the EVAPerf component instead, then, set this parameter to none.

Username,
Password and
Confirm Password

To use the SSSU.exe for discovering the friendly names of device ports, specify the user credentials using which the HP EVA array is to be accessed in the Username and Password text boxes. Confirm the password by retyping it in the Confirm Password text box. If you do not wish to use the SSSU.exe, then set these parameters to none

Timeout

Indicate the duration (in seconds) for which this test should wait for a response from the storage device. By default, this is set to 60 seconds.

Detailed Diagnosis

To make diagnosis more efficient and accurate, the eG Enterprise suite embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option.

The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:

  • The eG manager license should allow the detailed diagnosis capability
  • Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Disk read requests

Indicates the rate at which read requests were made to this physical disk.

Reqs  /sec

The detailed diagnosis of this measure reveals the enclosure number and disk group to which this disk belongs.

Disk write requests

Indicates the rate at which write requests were received by this physical disk.

Reqs  /sec

 

Data read from disk

Indicates the rate at which data is read from disk.

MB/sec

 

Data written to disk

Indicates rate at which data is written to this disk.

MB/sec

 

Read latency

Indicates the time taken for reading from this disk.

Ms

Ideally, this value should be low. A high value could indicate that something is slowing down reads from the disk.

Write latency

Indicates the time taken for writing to this disk.

Ms

Avg. queue size

Indicates the number of requests to this disk that are in queue.

Number

A high value of this measure or a consistent increase in measure value could indicate the existence of a processing bottleneck on the disk.