Measures reported by PureHGrpPerfTest
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.
Outputs of the test : One set of results for each host group for which the target FlashArray provisions volume.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| readBandwidth |
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. |
| writeBandwidth |
Indicates the amount of data utilized for performing write operations on this host group per second. |
MB/Sec |
| avgBandwidth |
Indicates the average amount of data utilized for performing I/O operations on this host group per second. |
MB/Sec |
|
| readOps |
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. |
| writeOps |
Indicates the number of write operations performed on this host group per second. |
IOPS |
| avgIOPS |
Indicates the average number of I/O operations performed on this host group per second. |
IOPS |
|
| readLatency |
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. |
| writeLatency |
Indicates the time taken to process the write operations during the last measurement period. |
Milliseconds |
| avgLatency |
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. |
|