|
Measures reported by HitachiBackendTest
Whenever the storage device experiences heavy workloads, the additional load on the device is transferred to the disk via multiple backend loops. Periodic monitoring of the I/O activity on the loops is essential to identify loops that are heavily loaded, and loops where data is moving slowly or is choking. This test auto-discovers the backend loops that are operational on a storage device, and reports load statistics pertaining to each loop.
This test is used to auto-discover the backend loops that are operational on a storage device, and reports load statistics pertaining to each loop.
The measures
made by this test are as
follows:
| Measurement |
Description |
Measurement
Unit |
Interpretation |
| IO_Rate |
Indicates the number of read/write commands transferred to the disk per second via this loop.
|
IOPS |
If this measure reports a high value or if the value of the measure increases consistently, it is indicative of unusually high I/O activity on this backend loop. Comparing the value of this measure across loops can accurately indicate which path is currently experiencing heavy traffic. Observing the variations in this measure over a period of time will enable you to identify roadblocks (if any).
|
| Read_Rate |
Indicates the number of read operations performed on the disk via this backend loop per second.
|
IOPS |
|
| Write_Rate |
Indicates the number of write commands issued on the disk per second via this loop.
|
IOPS |
|
| Trans_Rate |
Indicates the transfer size of read/write commands per second.
|
KB/sec |
|
| Read_Trans_Rate |
Indicates the transfer size of read commands per second.
|
KB/sec |
|
| Write_Trans_Rate |
Indicates the transfer size of write commands per second.
|
KB/sec |
|
| OnlineVerify_CmdCount |
Indicates the number of Online Verify Commands of the Backend per second.
|
KB/sec |
|
|