2012/10/31 Tren Blackburn <tren@xxxxxxxxxxxxxxx>: > Unless you're using btrfs which writes to the journal and osd fs > concurrently, if you lose the journal device (such as due to a > reboot), you've lost the osd device, requiring it to be remade and > re-added. I don't understood. Loosing a journal, will result in the whole OSD lost? AFAIK, Ceph will write to journal. After this write it will return an "OK". After that, the journal is wrote (in background) to a disk, so, loosing a journal should result in loosing that portion of data, not the whole osd. Now, in case of 3 replicated nodes, ceph will write the same data at the same time to the three journals? If yes, loosing a single journal/osd should not result in loss of data, because the same data are still on other 2 nodes. In this case, should be possible to use a tmpfs as journal and using the replica as redundancy. -- 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
