Hi Fred, There is a fencing mechanism. There is work underway to wire it up to an iSCSI target (LIO in this case), but I think that isn't needed to simply run ocfs2 (or similar) directly on top of an RBD device. Honestly I'm not quite sure how that would glue together. sage On Mon, 20 Oct 2014, Fred Yang wrote: > > Sage, > Even with cluster file system, it will still need a fencing mechanism to > allow SCSI device shared by multiple host, what kind of SCSI reservation RBD > currently support? > > Fred > > Sent from my Samsung Galaxy S3 > > On Oct 20, 2014 4:42 PM, "Sage Weil" <sage@xxxxxxxxxxxx> wrote: > On Mon, 20 Oct 2014, Dianis Dimoglo wrote: > > I installed ceph two nodes, 2 mon 2 osd in xfs, also used the > RBD and > > mount the pool on two different ceph host and when I write > data through > > one of the hosts at the other I do not see the data, what's > wrong? > > Although the RBD disk can be shared, that will only be useful if > the file > system you put on top is designed to allow that. The usual > suspects > (ext4, xfs, etc.) do not--they assume only a single host is > using the disk > at any time. That means that unless you deploy a cluster fs > like ocfs2 or > gfs2, you can only use an RBD on a single host at a time. > > sage > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > >
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