"Error:No space left on device" Is Displayed

Symptom

The following error message is displayed when the cluster is being used:

Error:No space left on device

Cause Analysis

The disk space is insufficient.

Procedure

• Run the following command to check the disk usage. The Avail column indicates the available disk space, and the Use% column indicates the percentage of disk space that has been used.

  [root@openeuler123 mnt]# df -h
  Filesystem                  Size  Used Avail Use% Mounted on
  devtmpfs                    255G     0  255G   0% /dev
  tmpfs                       255G   35M  255G   1% /dev/shm
  tmpfs                       255G   57M  255G   1% /run
  tmpfs                       255G     0  255G   0% /sys/fs/cgroup
  /dev/mapper/openeuler-root  196G  8.8G  178G   5% /
  tmpfs                       255G  1.0M  255G   1% /tmp
  /dev/sda2                   9.8G  144M  9.2G   2% /boot
  /dev/sda1                    10G  5.8M   10G   1% /boot/efi

  The demand for remaining disk space depends on the increase in service data. Suggestions:

  • Check the disk space usage status, ensuring that the remaining space is sufficient for the growth of disk space for over one year.
  • If the disk space usage exceeds 60%, you must clear or expand the disk space.

• Run the following command to check the size of the data directory.

   du --max-depth=1 -h /mnt/

  The following information is displayed. The first column shows the sizes of directories or files, and the second column shows all the sub-directories or files under the /mnt/ directory.

  [root@MogDB36 mnt]# du --max-depth=1 -h /mnt
  83G /mnt/data3
  71G /mnt/data2
  365G    /mnt/data1
  518G    /mnt

• Clean up the disk space. You are advised to periodically back up audit logs to other storage devices. The recommended log retention period is one month. pg_log stores database process run logs which help database administrators locate faults. You can delete error logs if you view them every day and handle errors in time.

• Delete useless data. Back up data that is not used frequently or used for a certain period of time to storage media with lower costs, and clean the backup data to free up disk space.

• If the disk space is still insufficient, expand the disk capacity.