VNX: How NFSv4 works on VNX with MIXED accesspolicy in a Multiprotocol Environment (User Correctable).

An ACL modification rebuilds the UNIX mode bits.

A file-system is exported via NFSv4 in a Multi-protocol Share. The file-system is mounted as 'MIXED' policy on the virtual data mover (VDM).

From the UJNIX client, a 'chmod' command was executed against a file exported from VNX NFS Share.

Refer to the attached document on how to configure NFSv4 and apply ACLs in a Multiprotocol environment.

VNX: 
[root@VNXCS nasadmin]# server_mount nfsv4 -o accesspolicy=MIXED nfsv4 /nfsv4
nfsv4 : done 
[root@VNXCS nasadmin]#  

Client: 
root@linux-client:~# df 
Filesystem                        1K-blocks    Used Available Use% Mounted on 
/dev/sda1                          19620732 4169992  14430992  23% / 
udev                                  10240       0     10240   0% /dev 
tmpfs                                206372    9320    197052   5% /run 
tmpfs                                515920      80    515840   1% /dev/shm 
tmpfs                                  5120       0      5120   0% /run/lock 
tmpfs                                515920       0    515920   0% /sys/fs/cgroup 
##.##.##.##://nfsv4               1032576    2688   1029888   1% /nfsv4 
root@linux-client:~# cd /nfsv4/ 
root@linux-client:/nfsv4# ll 
total 0 
root@linux-client:/nfsv4#  

Before:  
root@linux-client:/nfsv4# nfs4_getfacl Windows/ 
A:g:user2@vnx.local:rxtncy 
A:fdi:user2@vnx.local:rxtncy 
A:fdi:user1@vnx.local:rxtncy 
A:fd:user1@vnx.localrwDxtTy 
A::OWNER@:rwaDxtTnNcCoy 
A:g:32770:rxtncy 
A::EVERYONE@:rxtncy 
A:fd:32769:rwaDdxtTnNcCoy 
A:fdg:32792:rwaDdxtTnNcCoy 
A:fdg:32793:rwaDdxtTnNcCoy 
A:fd:32775:rwDxtTy 
root@linux-client:/nfsv4#  

Change:  
root@linux-client:/nfsv4# ll 
total 16 
drwxrwxr-x 2 nobody root        80 Jul 26 08:03 linux 
drwxr-xr-x 2  32768      32768  80 Jul 25 13:17 Windows 
root@linux-client:/nfsv4# chmod 744 Windows/

After:
root@linux-client:/nfsv4# ll 
total 16 
drwxrwxr-x 2 nobody root        80 Jul 26 08:03 linux 
drwxr--r-- 2  32768      32768  80 Jul 25 13:17 Windows 
root@linux-client:/nfsv4#  

This is functioning as designed [FAD].

Reference working on ACL on NFSv4 protocol on page 19 of the "Managing a Multiprotocol environment" document.
https://support.emc.com/docu48454_Managing-a-Multiprotocol-Environment-on-VNX-8.1.pdf?language=en_US

ACLs for files and directories are created from the protocol that last set or changed the permissions. For example, if an NFS client sets or changes permissions on a file or directory, the ACL is rebuilt based on the UNIX mode bits. If a CIFS client sets or changes permissions on a file or directory, the ACL is built based on the standard Windows permissions.

ACL is checked. If there is not an ACL, one is created based on the UNIX mode bits. Access is also determined by the ACL.NFSv4 clients can manage the ACL. An ACL modification rebuilds the UNIX mode bits but the UNIX rights are not checked.            

This is working as designed in a Linux environment.

If permissions are to be changed on NFSv4 mounted files, use the 'nfs4_setfacl' command. Running 'chmod' will trigger a recalculation against the UNIX bit mode.

Reference the attached documents for further details on working on ACLs.