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Help Center/ Elastic Cloud Server/ Troubleshooting/ Disk Space Management Issues/ Why Do I Get the Error "No space left on device" When I Create a File on a Linux ECS?

Why Do I Get the Error "No space left on device" When I Create a File on a Linux ECS?

Updated on 2023-03-03 GMT+08:00

Symptom

When you create a file on a Linux ECS, the error message "No space left on device" is displayed.

Possible Causes

  • The block usage on the disk reaches 100%.
  • The inode usage on the disk reaches 100%.
  • Certain disk space is not freed up because there are unreleased file handles.
  • The value of fs.inotify.max_user_watches has been reached.

100% Block Usage

Run the following command to view the disk space usage:

df -h

If information similar to the following is displayed, the blocks have been used up.

Solution: Expand the capacity of the disk.

100% Inode Usage

Run the following command to view the inode usage:

df -i

If information similar to the following is displayed, the inodes have been used up.

Solution: Expand the capacity of the disk.

Space Occupied by Deleted Files

  1. Run the df -h command to check whether the block usage reaches 100%.
  2. Run the df -i command to check whether the inode usage is relatively low, for example 1%, as shown in the following figure.
  3. Run the du -sh command to view the total disk space used by files. You may notice that there is a significant difference between the usage space and available space.

Solution

  1. Run the following command to list deleted files whose handles are still held open by processes:

    lsof |grep delete

  2. Run the following command to stop these processes one at a time:

    kill -9 Process ID

inotify Watch Limit Reached

If inotify watches are used up, "No space left on device" will be displayed.

Solution

  1. Run the following command to edit the /etc/sysctl.conf file:

    vi /etc/sysctl.conf

  2. Add the following content to the file:
    fs.inotify.max_user_watches = 524288
  3. Run the following command for the modification to take effect:

    sysctl -p

    inotify is used to monitor file system events. By default, a maximum of 8192 files can be watched for each real user ID. You can run the following command to obtain the current limit:

    cat /proc/sys/fs/inotify/max_user_watches

    If the limit is too low to watch all files, increase the limit.

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