Unknown NFSv4 ACL permission

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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@xxxxxxxxxx: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.

--
Paul Heinlein
heinlein@xxxxxxxxxx
45°38' N, 122°6' W
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