Pure Host Groups Test

Host groups are collections of hosts for which the FlashArray maintains consistent shared volume connections. The hosts are virtual or physical computers (typically application or database servers) that are connected to the FlashArray network through their Fibre Channel or iSCSI ports.

By monitoring each host group associated with the FlashArray, administrators can pin point the host groups that are handling more I/O requests than the rest. This way, irregularities in the distribution of I/O load across host groups can be detected at ease. In addition, the test also proactively alerts administrators to probable slowdowns in I/O processing by specific host group, thereby enabling administrators to initiate pre-emptive actions.

Target of the test : Pure Storage FlashArray

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each host group for which the target FlashArray provisions volume.

Configurable parameters for the test

Parameter	Description
Test Period	How often should the test be executed.
Host	The IP address of the host for which this test is to be configured.
Port	The port at which the device listens. By default, this will be NULL.
API Token	The eG agent collects the required metrics from the Pure Storage Flash Array by executing API commands using Pure Storage REST API on the FlashArray and pulls out critical metrics. In order to collect metrics, the eG agent should be provided with a valid API token. To know how to determine the API token, refer to Pre-requisites for Monitoring the Pure Storage FlashArray. Specify the determined API token in the API Token text box.

Measurements made by the test

Measurement	Description	Measurement Unit	Interpretation
Read bandwidth	Indicates the amount of data utilized for performing read operations on this host group per second.	MB/Sec	A consistent decrease in the value of these measures for the host groups indicates an I/O processing bottleneck.
Write bandwidth	Indicates the amount of data utilized for performing write operations on this host group per second.	MB/Sec
Average bandwidth	Indicates the average amount of data utilized for performing I/O operations on this host group per second.	MB/Sec
Read IOPS	Indicates the number of read operations performed on this host group per second.	IOPS	A consistent decrease in the value of these measures for the host groups indicates an I/O processing bottleneck.
Write IOPS	Indicates the number of write operations performed on this host group per second.	IOPS
Average IOPS	Indicates the average number of I/O operations performed on this host group per second.	IOPS
Read latency	Indicates the time taken to process the read operations during the last measurement period.	Milliseconds	Very high values for these measures are indicative of the existence of road-blocks to rapid reading/writing on the host group.
Write latency	Indicates the time taken to process the write operations during the last measurement period.	Milliseconds
Average latency	Indicates the average time taken to process the I/O operations during the last measurement period.	Milliseconds	Ideally, the value of this measure is preferred to be low. A high value of this measure indicates that the I/O operations are slowly performed on the host group.