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Initiators can be managed by assigning them to an Initiator Group. If too many initiators are available in an EMC XtremIO cluster, then individual monitoring of each initiator becomes difficult for the administrators. To avoid such inconvenience but at the same time monitor the I/O processing of the initiators without any lag, administrators can use the XIOInitGrpsTest test.

This test auto discovers the initiator groups of the target storage array and helps administrators to figure out the initiator group that is busy processing I/O requests, detect irregularities in the distribution of I/O load across the initiator groups and thus enables administrators to initiate pre-emptive measures.

Outputs of the test : One set of results for each initiator group of the target EMC XtremIO being monitored

Measurement	Description	Measurement Unit	Interpretation
bandwidth	Indicates the total amount of data utilized for performing I/O operations per second on this initiator group.	MB/Sec
readBandwidth	Indicates the amount of data utilized for performing read I/O operations per second on this initiator group.	MB/Sec	High values for these measures indicate high bandwidth usage by this initiator group folder. By comparing the values of these measures across the initiator group, you can isolate those initiator group that consume bandwidth excessively, and also understand which operation consumed too much of bandwidth - is it reading? or writing?
writeBandwidth	Indicates the amount of data utilized for performing write I/O operations per second on this initiator group.	MB/Sec
iops	Indicates the rate at which I/O operations were performed on this initiator group.	IOPS	Compare the value of this measure across the initiator group to know which initiator group is handling the maximum number of I/O operations.
readIOPS	Indicates the rate at which read operations were performed on this initiator group.	IOPS
writeIOPS	Indicates the rate at which write operations were performed on this initiator group.	IOPS	A high value is desired for this measure. A low value for this measure may indicate a poor throughput thus resulting in a decrease in the free space of the initiator group and the overall performance.
reads	Indicates the number of read operations performed on this initiator group per second during the last measurement period.	Reads/sec	Compare the value of this measure across initiator groups to know which initiator group is handling the maximum number of read requests.
writes	Indicates the number of write operations performed on this initiator group per second during the last measurement period.	Writes/Sec	Ideally, the value of this measure should be high. A steady dip in this measure value could indicate a potential writing bottleneck. By comparing the value of this measure across the initiator group folders, you can quickly identify the initiator group folder which is the slowest in processing write requests.
dataReads	Indicates the rate at which data was read from this initiator group during the last measurement period.	MB/Sec	Compare the values of these measures across the initiator groups to identify the slowest initiator group in terms of servicing read and write requests (respectively).
dataWritten	Indicates the rate at which data was written to this initiator group during the last measurement period.	MB/Sec
avgReadSize	Indicates the amount of data read from this initiator group per I/O operation during the last measurement period.	MB/Op	Compare the values of these measures across the initiator groups to identify the slowest initiator group in terms of servicing read and write requests (respectively).
avgWriteSize	Indicates the amount of data written to this initiator group per I/O operation during the last measurement period.	MB/Op