Cross-protocol locking allows CIFS users and NCP users to concurrently access files by allowing only one user at any time to open the file for write. Multiple users who are accessing via NCP and CIFS can open a file for read only.
WARNING:Allowing users who access files via different protocols to concurrently open a file for write can lead to data corruption.
If cross-protocol locking is enabled for NCP Server for Linux but stops working for DST shadow volume pairs—that is, multiple users can open a file for read and write—it is probably because ShadowFS needs to be restarted. To resolve this problem, stop the shadowfs process, then start shadowfs. For information, see Starting and Stopping ShadowFS Manually
in the OES 2018 SP3: Dynamic Storage Technology Administration Guide.