Future: Filesystem ACL and SCM
mgalgoci at redhat.com
Tue Mar 20 20:06:16 UTC 2007
> I talked with a few filesystem experts within Red Hat. They said...
> - ext3 has a limit of 4KB for xattr data. If you use the standard encoding of
> 8 bytes per uid, that has a limit of roughly 100 entities that could be
> associated with a file. Is this too limiting? I dunno. Perhaps it need not
> be too limiting if more extensive use of group-based-ACL's are used.
> - XFS could possibly allow a maximum of 64KB xattr's per file, but that is
> very inefficient in filesystem storage.
> - xattr's are currently not supported by NFS.
The other thing to concider is backup and restore of acls and xattrs. I think
this area is probably a weak spot as well but I believe star and rsync do
have some kind of support for acls.
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