EVA LUN Group Test

This test auto-discovers the LUN groups on an EVA storage array, tracks the I/O requests to each group, and reveals how well the cache services these requests.

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 LUN group on an 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 Lun 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 Lun 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
Read requests served from cache	Indicates the rate at which requests to this LUN group were served by the cache.	Reqs /sec
Data reads from cache	Indicates the rate at which this LUN group read data from the cache.	MB/sec
Avg. read time from cache	Indicates the average time taken for reading from cache.	Ms	A high value could indicate an I/O bottleneck.
Read requests missed from cache	Indicates the rate at which read requests to the LUN group were serviced by the disk and not the cache.	Reqs/sec	Ideally, this rate should be low. A high rate indicates a large number of direct disk accesses, which in turn may expose the physical disk to overuse, and may increase the processing overheads.
Data read from physical disks	Indicates the rate at which data was read from the physical disk and not the cache.	MB/sec
Avg. time for disk reads	Indicates the time taken by this test for reading from the physical disk.	Ms
Write requests served by cache	Indicates the rate at which write requests to the LUN group were serviced by the cache.	Reqs/sec
Data written to cache	Indicates the rate at which data was written to the cache.	MB/sec
Avg. time for disk writes	Indicates the time taken for writing to disk.	Ms	A high value could indicate an I/O bottleneck.