ALM-12018 Memory Usage Exceeds the Threshold

Description

The system checks the memory usage of the system every 30 seconds and compares the actual memory usage with the threshold. The memory usage has a default threshold, this alarm is generated when the value of the memory usage exceeds the threshold.

When the Trigger Count is 1, this alarm is cleared when the host memory usage is less than or equal to the threshold. When the Trigger Count is greater than 1, this alarm is cleared when the host memory usage is less than or equal to 90% of the threshold.

Attribute

Alarm ID	Alarm Severity	Auto Clear
12018	Major	Yes

Parameters

Name	Meaning
Source	Specifies the cluster or system for which the alarm is generated.
ServiceName	Specifies the service for which the alarm is generated.
RoleName	Specifies the role for which the alarm is generated.
HostName	Specifies the host for which the alarm is generated.
Trigger Condition	Specifies the threshold triggering the alarm. If the current indicator value exceeds this threshold, the alarm is generated.

Impact on the System

Service processes respond slowly or become unavailable.

Possible Causes

Memory configuration cannot meet service requirements. The memory usage reaches the upper limit.
The SUSE 12.X OS has an earlier free command. The calculated memory usage cannot reflect the real-world memory usage.

Procedure

Perform the following operations if SUSE 12.X is used.

Log in to any node in the cluster as user root, and run the cat /etc/*-release command to check whether the OS is SUSE 12.X as user root.
- If yes, go to 2.
- If no, go to 4.
Run the cat /proc/meminfo | grep Mem command to check the real-world memory usage of the OS.
```
MemTotal: 263576192 kB 
MemFree: 198283116 kB 
MemAvailable: 227641452 kB
```
Calculate the real-world memory usage: Memory usage = 1 - (Memory available/Memory total)
- If the memory usage is lower than 90%, manually disable transferring from monitoring indicators to alarms.
- If the memory usage is higher than 90%, go to 4.

Expand the system.

In the alarm list on FusionInsight Manager, click in the row where the alarm is located to view the alarm host address in the alarm details.
Log in to the host where the alarm is generated as user root.
If the memory usage exceeds the threshold, perform memory capacity expansion.
Run the command free -m | grep Mem\: | awk '{printf("%s,", ($3-$6-$7) * 100 / $2)}' to check the system memory usage.
Wait for 5 minutes, check whether the alarm is cleared.
- If yes, no further action is required.
- If no, go to 9.

Collect fault information.

On the FusionInsight Manager in the active cluster, choose O&M > Log > Download.
Select OmmServer from the Service and click OK.
Click in the upper right corner, and set Start Date and End Date for log collection to 10 minutes ahead of and after the alarm generation time, respectively. Then, click Download.
Contact the O&M personnel and send the collected log information.