Problem nfs export, on Red Hat client not preserve file access permissions

Question

My Isilon administrator created me a resource for linux (NFS Export). When mounting it on a Red Had 5.8 and 6.9 client, I observe the following behavior in file or folder access permissions: #cat /etc/mtab 142.204.7.24:/ifs/data/w_prueba /prueba3 nfs rw,intr,nolock,bg,hard,rsize=32768,wsize=32768,tcp,retrans=0,addr=142.204.7.24 0 0 #cd /prueba3 #mkdir testDIR #ls -lad testDIR drwxrwxr-x 2 314247 CC_HR_DISENO 0 Jul 24 18:34 testDIR/ #chmod 770 testDIR drwxrwxr-x 2 314247 CC_HR_DISENO 0 Jul 24 18:34 testDIR/ #chmod 700 testDIR -v  mode of `testDIR/' changed to 0700 (rwx------) #ls -lad testDIR drwxrwxr-x 2 314247 CC_HR_DISENO 0 Jul 24 18:34 testDIR/   As you can see the permissions are not changed no matter what I do with the chmod command. But if I do this on the local disk (/ tmp for example) the system respects the changes that I apply with the chmod command. This makes me dismiss a problem with the client's operating system and I think the problem is in the NAS server (Isilon). Any idea what it could be?

scottkiss · Answer

I'm guessing your cluster is configured for both Windows and Unix clients. We just got through a support call with Dell and landed on this KB article that goes into how Windows ACLs behave alongside POSIX permissions. https://www.dell.com/support/kbdoc/en-us/000098455/emc14001113-whitepaper-ace-posix-interaction-in-onefs?lang=en

We had to run a chmod -b against a folder on the Isilon itself to get it to strip off the Windows ACL from that location and then the NFS client could change permissions and would see what they expected to see.

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