eG Help

Hosts are virtual or physical computers (typically application or database servers) that are connected with the FlashArray network through their Fibre Channel or iSCSI port. The FlashArray recognizes and communicates with the hosts by Fibre Channel worldwide names (WWNs) or iSCSI qualified names (IQNs) associated with the ports. The I/O requests and data stored on the FlashArray volume are communicated to the hosts through the ports.

Using this test, administrators can monitor each host connected to the FlashArray and can pin point the hosts that are handling more I/O requests than the rest. This way, irregularities in the distribution of I/O load across hosts can be detected at ease. In addition, the test also proactively alerts administrators to probable slowdowns in I/O processing by a specific host, thereby enabling administrators to initiate pre-emptive actions.

Outputs of the test : One set of results for each host connected to the target FlashArray being monitored.

Measurement	Description	Measurement Unit	Interpretation
readBandwidth	Indicates the amount of data utilized for performing read operations on this host per second.	MB/Sec	A consistent decrease in the value of these measures for the hosts indicates an I/O processing bottleneck.
writeBandwidth	Indicates the amount of data utilized for performing write operations on this host per second.	MB/Sec
avgBandwidth	Indicates the average amount of data utilized for performing I/O operations on this host per second.	MB/Sec	Compare the value of this measure across the hosts to know the host that uses more bandwidth to process the I/O requests.
readOps	Indicates the number of read operations performed on this host per second.	IOPS	Ideally, the value of this measure should be very low. A high value or a steady increase in this value could indicate an I/O processing bottleneck on the array.
writeOps	Indicates the number of write operations performed on this host per second.	IOPS
avgIOPS	Indicates the average number of I/O operations performed on this host per second.	IOPS	This measure is a good indicator of I/O load on every host connected to the FlashArray.
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 hosts
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 should be very low. A high value or a steady increase in this value could indicate an I/O processing bottleneck on the host.