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Forum Discussion
Rysnc or backup to second NAS loses permissions / ACLs
Has anyone noticed that backups from one ReadyNAS to another (both members of Active Directory) screw up the permissions? We have a production unit RN3220 which hosts our main file sharing system...
ReadyNAS maps Windows SIDs to local UID/GIDs (winbind with a local idmap table). Unfortunately this means that across different ReadyNAS you will have different SID->U/GID mappings, leading to permissions issues.
For more information see: https://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/idmapper.html (Winbind/NSS with the default local IDMAP table)
Exporting the mapping from your source to your destination should resolve the permission issue. You'll need to do it from SSH, an option to do this in the UI is in the works (but hasn't made release yet):
http://ram.kossboss.com/exporting-importing-user-id-maps-samba/
If you have any new users login to the source NAS after the export/import you'll need to do it again to update the destination NAS with the new mapping.
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