On Fri, Jun 29, 2012 at 2:11 PM, Gregory Farnum <greg@xxxxxxxxxxx> wrote: > Well, actually this depends on the filesystem you're using. With > btrfs, the OSD will roll back to a consistent state, but you don't > know how out-of-date that state is. Ok, so assuming btrfs, then a single machine failure with a ramdisk journal should not result in any data loss, assuming replication is working? The cluster would then be at risk of data loss primarily from a full power outage. (In practice I'd expect either one machine to die, or a power loss to take out all of them, and smaller but non-unitary losses would be uncommon.) Something to play with, perhaps. Brian. -- 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
