On Wed, Dec 17, 2014 at 2:31 PM, McNamara, Bradley <bradley.mcnam...@seattle.gov> wrote: > I have a somewhat interesting scenario. I have an RBD of 17TB formatted > using XFS. I would like it accessible from two different hosts, one > mapped/mounted read-only, and one mapped/mounted as read-write. Both are > shared using Samba 4.x. One Samba server gives read-only access to the > world for the data. The other gives read-write access to a very limited set > of users who occasionally need to add data. > > > However, when testing this, when changes are made to the read-write Samba > server the changes don’t seem to be seen by the read-only Samba server. Is > there some file system caching going on that will eventually be flushed? > > > > Am I living dangerously doing what I have set up? I thought I would avoid > most/all potential file system corruption by making sure there is only one > read-write access method. Thanks for any answers.
Well, you'll avoid corruption by only having one writer, but the other reader is still caching data in-memory that will prevent it from seeing the writes on the disk. Plus I have no idea if mounting xfs read-only actually prevents it from making any writes to the disk; I think some FSes will do stuff like defragment internal data structures in that mode, maybe? -Greg _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
