Our new-to-us Isilon is handling NFSv4 ACLs differently than other NFS
file servers we’ve had. In particular, something causes an ‘O’ to pop up in the permission field, but I cannot find any documentation of it. For example,

[Linux]$ nfs4_getfacl TODO
A::OWNER@:tTcCy A::GROUP@:tcy A::EVERYONE@:rwaxtTnNcy A:O:OWNER@:rwadxtTnNcCoy A:gO:admins@madboa.com:rwadxtTnNcy A:gO:readonly@madboa:rxtnc A:O:EVERYONE@:tncy

I’ll note that when those ‘O’ perms get added, our OmniOS
(Solaris-alike) hosts cannot read the ACLs:

[SunOS]$ ls -v TODO
ls: can’t read ACL on TODO: Invalid argument
-rwxrwx— 1 heinlein wheel 2488 Oct 2 15:13 TODO

If, on the Linux side, I run nfs4_editfacl and do nothing but remove the ‘O’ permission symbols, then things clear up.

Has anyone here seen anything like this? My google-fu has failed.