Measures reported by PureVolPerfTest
For users to be able to read from/write data into volumes quickly, adequate space must be available in the volumes and the I/O requests should be processed rapidly by the volumes. Slowdowns in data storage/retrieval can be attributed to storage space contentions experienced by one/more volumes or I/O processing bottlenecks. In the event of such slowdowns, administrators need to swiftly isolate the following:
Which volumes are over-utilized? Which volumes are overloaded? Which volumes are experiencing serious latencies? When were these latencies observed most frequently - while reading or writing?
The PureVolPerfTest test provides accurate answers to these questions. With the help of these answers, you can quickly diagnose the root-cause of slowdowns when reading from/writing into a volume.
Outputs of the test : One set of results for each volume of the target FlashArray.
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 volume per second. |
MB/Sec |
A consistent decrease in the value of these measures for a volume indicates an I/O processing bottleneck. |
| writeBandwidth |
Indicates the amount of data utilized for performing write operations on this volume per second. |
MB/Sec |
| avgBandwidth |
Indicates the average amount of data utilized for performing I/O operations on this volume per second. |
MB/Sec |
Compare the value of this measure across the volumes to know the volume that uses more bandwidth to process the I/O requests. |
| readOps |
Indicates the number of read operations performed on this host per second. |
IOPS |
A consistent decrease in the value of these measures for a volume indicates an I/O processing bottleneck. |
| writeOps |
Indicates the number of write operations performed on this volume per second. |
IOPS |
| avgIOPS |
Indicates the average number of I/O operations performed on this volume 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 by this volume 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 volumes. |
| writeLatency |
Indicates the time taken by this volume to process the write operations during the last measurement period. |
Milliseconds |
| avgLatency |
Indicates the average time taken by this volume to process the I/O operations during the last measurement period. |
Milliseconds |
A consistently high value for this measure is a cause of concern. |
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