PowerScale: AIX Clients unable to mount NFSv4.0 in OneFS 9.3+ with error invalid argument.

Summary: AIX clients are unable to mount exports using NFSv4.0 starting in OneFS 9.3+. NFSv3 works with no issue.

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Symptoms

AIX clients are unable to mount NFSv4.0 in OneFS 9.3+ with an error invalid argument.

Mounting with NFSv3 shows no issues. 

Example of behavior:

# mount -o vers=4,soft powerscale:/ifs/AIX /mnt
mount: giving up on: 
	powerscale:/ifs/AIX
vmount : Invalid argument 

# mount -o vers=3,soft powerscale:/ifs/AIX /mnt
# ls /mnt
testfile
#

Cause

AIX’s nfsv4 mount includes the Suppattr_ExclCreat attribute request. The Suppattr_ExclCreat attribute is part of the NFSv4.1 standard. 

As of OneFS 9.3, Powerscale now supports NFSv4.1/4.2, while AIX only supports NFSv4.0. 

So the Powerscale sees the request for 4.1 attributes, but since AIX only supports 4.0 the request is rejected. Prior to OneFS 9.3, this request was fine as Powerscale only supported NFSv4.0 as well. 

This can be seen in packet captures as well:

packet capture 

packet capture 

Resolution

IBM/AIX support needs to be engaged to address the client sending an NFSv4.1 attribute when only NFSv4.0 is supported.

The following can be referenced when engaging IBM support. 

IJ41058: NFS4 MOUNT FAILS WITH NETAPP SERVER DUE TO SUPPATTR_EXCLCREAT APPLIES TO AIX 7200-05This hyperlink is taking you to a website outside of Dell Technologies.

Affected Products

Isilon, PowerScale OneFS, Isilon Scale-out NAS
Article Properties
Article Number: 000202921
Article Type: Solution
Last Modified: 27 Nov 2025
Version:  3
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