Viewing Analysis Results
Prerequisites
A storage I/O diagnosis task has been created and the analysis is complete.
Procedure
- In the System Diagnosis area on the left, click the name of the target analysis task.
The node list is displayed.
- Click a node name to view the analysis result, as shown in Figure 1. Table 1 describes the parameters.
Table 1 Parameters in the pressure test result Parameter
Description
Pressure Test Object
Object that has been tested.
Request Block Size
Size of the request block.
Read/Write Mode
Read or write mode.
I/O Queue Depth
Depth of an I/O queue.
I/O Engine
I/O engine.
Concurrency
Concurrency statistics.
Direct I/O
Indicates whether to read the buffer first.
I/O Size (MiB)
Size of the I/O.
Test Duration (s)
Time used by the test.
Read Throughput
Throughput of reads.
Write Throughput
Throughput of writes.
Read IOPS
Read throughput per second.
Write IOPS
Write throughput per second.
Read Latency
Latency of read operations.
Write Latency
Latency of write operations.
Throughput (KiB/s)
Total throughput.
IOPS
Total throughput per second.
Latency (ms)
Total latency.
Latency
Type
Latency type.
Max. (ms)
Maximum latency.
Min. (ms)
Minimum latency.
Average (ms)
Average latency.
Standard Variance (ms)
Standard variance of the latency.
Latency Distribution
Latency Range (ms)
Distribution range of the latency.
Proportion (%)
Proportion of the latency in each range.
I/O Depth Distribution
I/O Depth Range
I/O depth distribution range.
Proportion (%)
Distribution proportion of I/Os in each depth range.
Pressure Test Process Performance
%user
Percentage of CPU time occupied when the pressure test process is running in user mode.
%system
Percentage of CPU time occupied when the pressure test process is running in kernel mode. This metric does not include the time spent on service hardware and software interrupts.
context switches
Number of times that the pressure test process is switched.
major page faults
Number of major page faults of the pressure test process. When a virtual memory address is mapped to a physical memory address, the corresponding page is in the swap memory. Such page faults are major page faults, which are generated when the memory is insufficient. Pages need to be loaded from the drive.
minor page faults
Number of secondary page faults of the pressure test process, that is, number of page faults generated when a virtual memory address is mapped to a physical memory address. No page needs to be loaded from the drive.
Storage Device Performance
Device Name
Name of the device for which the pressure test is performed.
I/O number
Total number of I/O times executed by the pressure test process.
merge number
Total number of merged I/Os in the pressure test process.
tick number
Total number of ticks when the drive is busy.
time spent in queue
Time spent in the queue.
util(%)
Drive usage statistics.
- Click the Task Information tab to view the detailed configuration and sampling information about the task on the current node.
If a task fails to be executed, the failure cause will be displayed on the Task Information tab page.
If some data fails to be collected but the overall task execution is not affected, you can view the exception message in Exception Information.
Collection End Cause displays the reason why the data collection of the current task ends, for example, "Task collection times up" or "File size reaches the collection limit."
