eG Monitoring
 

Measures reported by NimbleIOPerfTest

This test monitors the I/O operations of the Nimble storage system and reports how well the I/O operations were read from/written to sequentially and in random. This test also helps you to figure out the total number of read and write operations and the average time taken to process each read operation and write operation on the Nimble Storage. This way, administrators can analyze the throughput of the Nimble Storage system and figure out if there exists any road blocks to the rapid reading/writing to the Nimble Storage and take remedial measures before any discrepancies arise.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
Seq_read_IO_operations Indicates the rate at which I/O operations were written sequentially during the last measurement period. IOPS  
Seq_write_IO_operations Indicates the average time taken to process the write operations during the last measurement period. 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 and the performance of the disks.
Random_read_IO_ops Indicates the rate at which random I/O operations were read during the last measurement period. IOPS  
Random_write_IO_ops Indicates the rate at which random I/O operations were written during the last measurement period. IOPS  
IO_reads Indicates the total number of I/O operations that were read during the last measurement period. Reads  
IO_writes Indicates the total number of I/O operations that were written during the last measurement period. Writes Ideally, high value is desired for this measure.
Avg_io_read_latency Indicates the average time taken to process each read operation during the last measurement period. MilliSeconds Very high values for these measures are indicative of the existence of road-blocks to rapid reading/writing by the Nimble Storage.

By observing the variations in these measures over time, you can understand whether the latencies are sporadic or consistent. Consistent delays in reading/writing could indicate that there are persistent bottlenecks (if any) in the Nimble Storage to speedy I/O processing.
Avg_io_write_latency Indicates the average time taken to process each write operation during the last measurement period. MilliSeconds
totalIOPS Indicates the total number of I/O operations performed per second. IOPS This measure is the total of Seq_read_IO_operations, Seq_write_IO_operations, Random_read_IO_ops and Random_write_IO_ops measures. The gradual increase in the value of this measure indicates a consistent rise of I/O load on the storage.
avgLatency Indicates the average time taken to process the total read and write operations. Milliseconds This measure is the sum of Avg_io_read_latency and Avg_io_write_latency measures. Ideally, the value of this measure is preferred to be low. A high value of this measure indicates that the storage is taking more time to process the I/O operations.