Troubleshooting AMI and kernel issues
Following, you can find information about troubleshooting issues related to certain Amazon Machine Image (AMI) or kernel versions when using Amazon EFS from an Amazon EC2 instance.
Topics
Unable to chown
You're unable to change the ownership of a file/directory using the Linux
chown command.
Kernel versions with this bug
2.6.32
Action to take
You can resolve this error by doing the following:
-
If you're performing
chownfor the one-time setup step necessary to change ownership of the EFS root directory, you can run thechowncommand from an instance running a newer kernel. For example, use the newest version of Amazon Linux. -
If
chownis part of your production work flow, you must update the kernel version to usechown.
File system keeps performing operations repeatedly due to client bug
A file system gets stuck performing repeated operations due to a client bug.
Action to take
Update the client software to the latest version.
Deadlocked client
A client becomes deadlocked.
Kernel versions with this bug
-
CentOS-7 with kernel Linux 3.10.0-229.20.1.el7.x86_64
-
Ubuntu 15.10 with kernel Linux 4.2.0-18-generic
Action to take
Do one of the following:
-
Upgrade to a newer kernel version. For CentOS-7, kernel version Linux 3.10.0-327 or later contains the fix.
-
Downgrade to an older kernel version.
Listing files in a large directory takes a long time
This can happen if the directory is changing while your NFS client iterates through the directory to finish the list operation. Whenever the NFS client notices that the contents of the directory changed during this iteration, the NFS client restarts iterating from the beginning. As a result, the ls command can take a long time to complete for a large directory with frequently changing files.
Kernel versions with this bug
CentOS and RHEL kernel versions lower than 2.6.32-696.el6
Action to take
To resolve this issue, upgrade to a newer kernel version.
