Amazon EFS auto-mounting in Studio - Amazon SageMaker

Amazon EFS auto-mounting in Studio

Amazon SageMaker supports automatically mounting a folder in an Amazon EFS volume for each user in a domain. Using this folder, users can share data between their own private spaces. However, users cannot share data with other users in the domain. Users only have access to their own folder.

The user’s folder can be accessed through a folder named user-default-efs . This folder is present in the $HOME directrory of the Studio application.

For information about opting out of Amazon EFS auto-mounting, see Opt out of Amazon EFS auto-mounting.

Amazon EFS auto-mounting also facilitates the migration of data from Studio Classic to Studio. For more information, see (Optional) Migrate data from Studio Classic to Studio.

Access point information

When auto-mounting is activated, SageMaker uses an Amazon EFS access point to facilitate access to the data in the Amazon EFS volume. For more information about access points, see Working with Amazon EFS access points SageMaker creates a unique access point for each user profile in the domain during user profile creation or during application creation for an existing user profile. The POSIX user value of the access point matches the HomeEfsFileSystemUid value of the user profile that SageMaker creates the access point for. To get the value of the user, see DescribeUserProfile. The root directory path is also set to the same value as the POSIX user value. 

SageMaker sets the permissions of the new directory to the following values:

  • Owner user ID: POSIX user value

  • Owner group ID: 0

  • Permissions 700

The access point is required to access the Amazon EFS volume. As a result, you cannot delete or update the access point without losing access to the Amazon EFS volume.

Error resolution

If SageMaker encounters an issue when auto-mounting the Amazon EFS user folder during application creation, the application is still created. However, in this case, SageMaker creates a file named error.txt instead of mounting the Amazon EFS folder. This file describes the error encountered, as well as steps to resolve it. SageMaker creates the error.txt file in the user-default-efs folder located in the $HOME directory of the application.