Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-12063 Unavailable Disk
Updated on 2026-10-21 GMT+08:00
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ALM-12063 Unavailable Disk

Alarm Description

The system checks whether the data disk of the current host is available every five minutes (on the hour in versions earlier than MRS 3.1.5). Operations such as file creation, file writing, and file deletion are performed in the mount directory of the disk. If the operations are successful, the disk is available and a clear alarm is reported. If the operations fail, a fault alarm is reported.

Alarm Attributes

Alarm ID

Alarm Severity

Auto Clear

12063

Major

Yes

Parameters

Parameter

Description

Source

Specifies the cluster or system for which the alarm is generated.

ServiceName

Specifies the name of 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.

DiskName

Specifies the disk for which the alarm is generated. (Supported in versions earlier than MRS 3.3.1)

Mount Point

Specifies the mount point of the disk partition for which the alarm was generated. (Supported in MRS 3.3.1 or later)

Disk ESN

Specifies the serial number of the disk for which the alarm was generated. (Supported in MRS 3.3.1 or later)

Impact on the System

If you need to modify or use data on a disk that is unwritable or unreadable, the job may fail.

Possible Causes

The permission on the disk mount directory is abnormal, the disk file system is damaged.

Handling Procedure

Check whether the permission of the disk mount directory is normal.

  1. Log in to MRS Manager. In the alarm list, click in the row that contains the alarm to view the IP address of the host and disk name for which the alarm is generated.
  2. Log in to the host for which the alarm is generated as user root.
  1. Run the following command to obtain the mount point and check whether the permission of the mount directory is unwritable or unreadable: 

    df -h |grep Disk name

    If the permission of the mount directory is 000 or the owner is root, the mount directory is unreadable and unwritable.

  2. Modify the directory permission.
  3. One hour later, check whether this alarm is cleared.

    • If it is, no further action is required.
    • If it is not, go to Step 6.

  1. Contact hardware engineers to rectify the disk.
  1. One hour later, check whether this alarm is cleared.

    • If it is, no further action is required.
    • If it is not, go to Step 8.

Collect fault information.

  1. On MRS Manager, choose O&M > Log > Download.
  2. Select NodeAgent 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

Parent Topic: MRS Cluster Alarm Handling Reference