Hi, I'm actually building a big file server for my company and is testing rsync intensively since two weeks to synchronize a stand-by server every 15 minutes. I've been really impressed by the performance of rsync :-) The filesystem is actually 140GB on XFS under linux running samba with acl support... And you already know the problem :-) Google told me you are planning full acl support (aka cross fs acls support) in version 3, but i can't wait for it, so i want to code a patch to support XFS acls. Assuming i'm a C programmer with some experience do you think it's doable (20-30 h)? Could give me some hints about where to look first? Many thanks to rsync developer... And SGI too :-)