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HUAWEI CLOUD Stack 6.5.0 Alarm and Event Reference 04

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ALM-73018 I/O Delay of the Swap Partition Is Too Long

ALM-73018 I/O Delay of the Swap Partition Is Too Long

Description

For the swap partition on the host, the system reads and saves the I/O delay of the local disk every 2 seconds. It obtains 50 I/O delay values every 100 seconds. This alarm is generated when the values of I/O delay for 35 times within 50 consecutive times are greater than 100 ms.

Attribute

Alarm ID

Alarm Severity

Auto Clear

73018

Major

Yes

Parameters

Name

Meaning

Fault Location Info

host_id: specifies the ID of the host for which the alarm is generated.

disk: specifies the name of the abnormal disk.

Additional Info

  • error_info: provides alarm exception information.
  • host_id: specifies the ID of the host for which the alarm is generated.
  • hostname: specifies the name of the host for which the alarm is generated.
  • HostIP: specifies the IP address of the host for which the alarm is generated.

Impact on the System

  • The CPU usage required for the disk I/O read and write is too high.
  • The service processing speed of the CPU is slow down.
  • For VMs that are not fully preoccupied, the internal memory performance of the VMs deteriorates and user experience deteriorates.
    NOTE:

    Fully preoccupied VMs: The memory of the VMs is allocated in advance.

    Non-fully preoccupied VMs: The memory of the VMs is allocated when it is used.

Possible Causes

  • The system responds slowly to disk I/O read and write operations due to hardware failures.
  • The actual memory usage of the host exceeds the threshold. As a result, the swap partition is frequently used.

Procedure

  1. Log in to the FusionSphere OpenStack web client.

    For details, see Logging In to the FusionSphere OpenStack Web Client (ManageOne Mode).

  2. Choose Configuration > Disk and click the host group to which the host belongs. In the Logical Disk area, click to configure the swap partition. You are advised to select an independent volume group.

    In the Expand Storage Capacity area, click to submit the modification.

  3. After 30 minutes, check whether the alarm is automatically cleared.

    • If yes, no further action is required.
    • If no, go to 4.

  4. Migrate some VMs on the host to another host to reduce the memory overcommitment rate of the host.

    For details, see "Migrating a VM" in the HUAWEI CLOUD Stack 6.5.0 O&M Guide.

  5. Check whether the alarm is automatically cleared.

    • If yes, no further action is required.
    • If no, contact technical support for assistance.

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Updated: 2019-08-30

Document ID: EDOC1100062365

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