Help Center > > User Guide> FusionInsight Manager Operation Guide> Alarm Reference (Applicable to MRS 3.x)> ALM-12018 Memory Usage Exceeds the Threshold

ALM-12018 Memory Usage Exceeds the Threshold

Updated at: Mar 25, 2021 GMT+08:00

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.

  1. 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.

  2. 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

  3. 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.

  1. 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.
  2. Log in to the host where the alarm is generated as user root.
  3. If the memory usage exceeds the threshold, perform memory capacity expansion.
  4. Run the command free -m | grep Mem\: | awk '{printf("%s,", ($3-$6-$7) * 100 / $2)}' to check the system memory usage.
  5. 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.

  1. On the FusionInsight Manager in the active cluster, choose O&M > Log > Download.
  2. Select OmmServer from the Service and click OK.
  3. 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.
  4. Contact the O&M personnel and send the collected log information.

Alarm Clearing

After the fault is rectified, the system automatically clears this alarm.

Related Information

None

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