We have a new FAS2020 and need to migrate all the data from a FAS250 on to it. There are hundreds of local groups on this FAS250 (because originally an old windows server was migrated to the FAS250 using SecureCopy which copies all the local groups and shares over as well as the files).
If I SnapMirror to the FAS2020 of course the local groups won't transfer. How can I copy the local groups to the new FAS and keep all my permissions intact? If I were to use SecureCopy (or other product) would the new RID's on the new FAS2020 be different to those on the FAS250? I don't really understand the role the RID's play in all this?
Windows SID is built from (at least) two parts – computer/domain SID and RID (Relative ID) that, to put is simple, is just consecutive numbering of objects, e.g. users or groups.
Lclgroups.cfg contains just RID for each group; but your file ACLs store full SIDs that include filer SID.
New filer most likely will get new SID when you run cifs setup, which means those new groups won’t match ACEs. It is the same as deleting and creating user with the same name – it is still different user from Windows point of view.