EVA Disk Groups Test

This test monitors the level of traffic on each physical disk group on an EVA storage array, and helps isolate irregularities in load balancing across the disk groups. Alongside, the test also helps identify which disk group is experiencing processing 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 disk group 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 Disk Group 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 Disk Group 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.

Measurements made by the test
Measurement	Description	Measurement Unit	Interpretation
Avg read requests	Indicates the rate at which read requests were made to this physical disk group.	Reqs /sec
Avg write requests	Indicates the rate at which write requests were received by this physical disk group.	Reqs /sec
Avg data reads	Indicates the rate at which data is read from disk.	MB/sec
Avg data writes	Indicates rate at which data is written to this disk group.	MB/sec
Avg read latency	Indicates the time taken for reading from this disk group.	Ms	Ideally, this value should be low. A high value could indicate that read operations are slowing down for some reason.
Avg write latency	Indicates the time taken for writing to this disk group.	Ms
Requests in queue	Indicates the number of requests to this disk group 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 group.
Disk count	Indicates number of disks in this disk group.	Number