On Fri, May 18, 2012 at 11:36 AM, Calvin Morrow <calvin.morrow@xxxxxxxxx> wrote: > I posted the same question to the list last week and never got a > reply. In addition, I'd also like to know if there's a difference in > failure behavior between XFS backed Ceph (writeahead journaling) and > BTRFS backed Ceph (parallel journaling). Actually, Sam replied to your email a week ago: http://thread.gmane.org/gmane.comp.file-systems.ceph.devel/6258/focus=6358 Summarizing/rephrasing: On both xfs & btrfs, a journal device giving I/O errors should make the osd stop operating. Losing a journal with xfs: you should destroy & recreate the osd, and your data is safe because of Ceph replication across osds. Losing a journal with btrfs: creating a new journal should let the osd recover the missing parts from replicas (and your data is safe mostly because of Ceph replication, recovery is just faster). -- 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
