eG Monitoring
 

Measures reported by XIOInitiatorTest

The XtremIO Storage Array uses the term “Initiators” to refer to ports which can access a volume. Initiators can be managed by assigning them to an Initiator Group. The Initiators within an Initiator Group share access to one or more of the cluster's volumes. This test auto discovers the initiators of the target storage array and reports the current connection state. In addition, this test helps administrators to figure out the initiator that is busy processing I/O requests along initiators, detect irregularities in the distribution of I/O load across the initiators and thus enables administrators to initiate pre-emptive measures.

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

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
connState Indicates the connection state of this initiator to the XtremIO storage array via atleast one target port.   The values reported by this measure and their numeric equivalents are available in the table below:

Measure Value Numeric Value
Connected 0
Disconnected 1
Unknown 1

Note:

This measure reports the Measure Values listed in the table above to indicate the connection state of this initiator. However, in the graph, this measure is indicated using the Numeric Values listed in the above table.
bandwidth Indicates the amount of data utilized for performing I/O operations per second through this initiator. MB/Sec  
readBandwidth Indicates the amount of data utilized for performing read I/O operations per second through this initiator. MB/Sec  
writeBandwidth Indicates the amount of data utilized for performing write I/O operations per second through this initiator. MB/Sec  
iops Indicates the rate at which I/O operations were performed through this initiator during the last measurement period. IOPS Compare the value of this measure across the initiators to know which initiator handled the maximum number of I/O operations and which handled the least. If the gap between the two is very high, then it indicates serious irregularities in I/O operations across the initiators.
readIOPS Indicates the number of read operations performed through this initiator per second. IOPS  
writeIOPS Indicates the number of the write operations performed through this initiator per second. IOPS  
readLatency Indicates the time taken to perform read operations through this initiator. msec A low value is desired for this measure. A high value indicates that the read and write operations take too long to execute which directly affects the performance of the Xtremio Storage Array.
writeLatency Indicates the time taken to perform write operations through this initiator. msec
avgLatency Indicates the average time taken to perform I/O operations through this initiator. msec  
reads Indicates the rate at which the read operations were performed through this initiator during the last measurement period. Reads/sec Compare the value of this measure across initiators to know which initiator handled the maximum number of read requests and which handled the least.
writes Indicates the rate at which the write operations were performed through this initiator 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 initiators, you can quickly identify the initiator which is the slowest in processing write requests.
dataReads Indicates the rate at which data was read through this initiator during the last measurement period. MB/Sec Compare the values of these measures across the initiators to identify the slowest initiator in terms of servicing read and write requests (respectively).
dataWritten Indicates the rate at which data was written through this initiator during the last measurement period. MB/Sec
avgReadSize Indicates the amount of data read through this initiator per I/O operation during the last measurement period. MB/Op Compare the values of these measures across the initiators to identify the slowest initiator in terms of servicing read and write requests (respectively).
avgWriteSize Indicates the amount of data written through this initiator per I/O operation during the last measurement period. MB/Op