In FusionInsight,how to resolve the alarm ALM-12028 The number of processes that are in the D state on the host exceeds the threshold?

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http://support.huawei.com/ehedex/pages/DOC1000113260YEF0811N/04/DOC1000113260YEF0811N/04/resources/alarm/ALM-12028.html?ft=0&id=aalm-12028

Other related questions:
In FusionInsight,What is the impact on system of ALM-12028 The number of processes that are in the D state on the host exceeds the threshold
Excessive system resources are used and the service process responds slowly.

In FusionInsight,What time does ALM-12028 The number of processes that are in the D state on the host exceeds the threshold
The system periodically checks the number of D state processes of user omm on the host every 30 seconds and compares the number with the threshold. The number of host D state processes has a default threshold.

In FusionInsight,What is the possible cause for ALM-12028 The number of processes that are in the D state on the host exceeds the threshold
The host responds slowly to I/O (disk I/O and network I/O) requests and a process is in the D state.

In FusionInsight,how to resolve the alarm ALM-12027 Host PID Usage Exceeds the Threshold?
http://support.huawei.com/ehedex/pages/DOC1000113260YEF0811N/04/DOC1000113260YEF0811N/04/resources/alarm/ALM-12027.html?ft=0&id=aalm-12027

In FusionInsight,how to resolve the alarm ALM-12018 Memory Usage Exceeds the Threshold?
Expand the system. 1.In the alarm list on FusionInsight Manager, locate the row that contains the alarm, and view the alarm host address in the alarm details. 2.Use PuTTY to log in to the host where the alarm is generated as user root. 3.Run the command free -m | grep Mem\: | awk '{printf("%s,", ($3-$6-$7) * 100 / $2)}' to check the system memory usage. 4.If the memory usage exceeds the threshold, perform memory capacity expansion. For details, see the FusionInsight HD Capacity Adjustment Guide. 5.Wait for 5 minutes, check whether the alarm is cleared. If yes, no further action is required. If no, go to Step 6.

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