On Thu, Dec 5, 2013 at 5:47 PM, Josh Durgin <josh.durgin@xxxxxxxxxxx> wrote: > On 12/03/2013 03:12 PM, Josh Durgin wrote: >> >> These patches allow rbd to block writes instead of returning errors >> when OSDs are full enough that the FULL flag is set in the osd map. >> This avoids filesystems on top of rbd getting confused by transient >> EIOs if the cluster oscillates between full and non-full. >> >> These are also available in the wip-full branch of ceph-client.git. >> >> Josh Durgin (3): >> libceph: block I/O when PAUSE or FULL osd map flags are set >> libceph: add an option to configure client behavior when osds are >> full >> rbd: document rbd-specific options > > > Due to a race condition between clients and osds in handling maps > marked FULL, it's not feasible to offer the 'error' option, so patches > 2 and 3 can be ignored. > > http://tracker.ceph.com/issues/6938 It's not clear to me — are you going to assume all ENOSPC means the map is marked as full and intercept it, or that you can't reliably block IO so don't bother trying? -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com -- 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
