On Wed, 6 Jun 2012, Guido Winkelmann wrote: > Am Dienstag, 5. Juni 2012, 14:33:19 schrieb Martin Wilderoth: > > > I have not done any changes installed at version 0.46 upgraded earlier and > > have been testing with ceph and ceph-fuse and backuppc. > > BackupPC and Ceph sounds like an interesting combination. Other than this > hanging MDS problem, what are your experiences with that? > > I'm asking because BackupPC is the only application I know of that actually > makes heavy use of hardlinks. Ceph, as far as I've understood it, supports > hardlinks, but works under the assumption that they're a rare and not > performance-critical corner case, and does some optimizations that help the > more common cases, but would probably hurt if you are using hardlinks a lot. Right. There is currently a scalability limit on the number of hard links, currently. Any large set of backuppc data will eat a lot of memory on mds.0 and (eventually) case problems. sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
