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Type: Bug
Resolution: Works as Designed
Priority: Major - P3
Fix Version/s: None
Affects Version/s: 3.2.10
Component/s: WiredTiger
Labels:
None

Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:

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（1）Keep the database operation scenario unchanged

（2）Watch the primary iops

（3）Watch the secondary iops
Observing the main iops situation

Show
（1）Keep the database operation scenario unchanged （2）Watch the primary iops （3）Watch the secondary iops Observing the main iops situation
Confidence Status:
None
Work Order:
3

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name:
None
Goal Link:
None

In the scenario of continuous insertion and update, the role of mongodb is changed on the same host, and iostat is used to monitor the performance of io. It is found that the value of %util is much lower than that of seconary while in role primary.