Data Domain: Resolving Permission Issues on Storage Units Accessed Through CIFS

One or more of the following symptoms may be observed:
Users receive"You do not have permission to access this folder" or"Access Denied" messages.
Applications using DD Boost or BoostFS can no longer access previously accessible files or directories.
Files or folders are visible through one access method but not another.
Backup, CyberSense, or other DD Boost-based workflows report access or permission-related failures.
BoostFS mounts successfully, but specific directories cannot be opened or enumerated.

A storage unit that is written and managed through Linux BoostFS is intended to be accessed using DD Boost ownership and permission controls. When a CIFS share is later created against the same storage unit, Windows/CIFS ownership and access semantics may be introduced to data that was originally written using Linux-based DD Boost access methods.
DD Boost and CIFS use different mechanisms for managing ownership, permissions, and file access. As a result, the protocols are not intended to manage the same dataset simultaneously. Introducing CIFS access to a DD Boost storage unit can lead to ownership inconsistencies that prevent DD Boost applications or BoostFS clients from accessing files and directories as expected.

If the affected storage unit has been accessed through a CIFS share and DD Boost access issues are suspected, remove the CIFS share and restore ownership of the storage unit to the appropriate DD Boost user.

Option 1: Remove the CIFS Share Using the Data Domain UI
Navigate to Protocols > CIFS > Shares (location may vary by DDOS version).
Select the CIFS share associated with the affected storage unit.
Click Delete.
When prompted, confirm the deletion by clicking OK.
Verify that the share is no longer listed.

Option 2: Remove the CIFS Share Using the CLI

Identify the existing share name:

cifs share show

Delete the share:

cifs share destroy <share-name>

Confirm that the share has been removed:

cifs share show

Reassign ownership of the storage unit to the correct DD Boost user:

ddboost storage-unit modify <storage-unit> user <correctUser>

Validate that BoostFS and any DD Boost applications can access the affected data.

Reference
Data Domain: DDBoost storage-unit modify Command Fails with Filesystem Communication Timeout