That wont help if he has files with infinite retention on a FLR compliance file system  For FLR enterprise the infinite retention date can be reduced – for compliance infinite really means.  We do state that clearly in our documentation “Setting the value to infinite mean that the file can never be deleted”  Only way to get rid of the fs in that case is to delete all LUNs including the DART OS and re-install the system – which of course deletes all data on it.
I have EMC Celerra NX4FC with 6.0.36-4 software. I was create file system with FLR-C function and used it several years. Today this file system not needed, i removed it share from CIFS fileserver. In process deleting filesystem from Celerra by clicking: Storage -> File Systems -> Right Click on FS ->choose "Delete" - I see this message: "The file systems selected for deletion contain at least one file system with FLR-C enabled. Protected files still exist on this file system and the file system cannot be deleted" I don't know how to remove this file system or disable FLR (read that it can not be disabled). All my attempts change FLR attributes via FLR Toolkit software were failed, FLR Toolkit used DHSM but Celerra can not activate DHSM on FLR-enabled FS: [nasadmin[NAME] ~]$ fs_dhsm -list id      name [nasadmin[NAME] ~]$ fs_dhsm -modify Classes -state enabled Error 13159628841: DHSM cannot be enabled on FLR file system, fsid: 21. [nasadmin[NAME] ~]$ How to delete a file system?  !
Deleting a file system with FLR