2012/11/6 Stefan Kleijkers <stefan@xxxxxxxxxxxxxxxxxxxx>: > Well you have to keep in mind that when a node fails the PG's that resided > on that node have to be redistributed over all the other nodes. So you begin > moving about 1% of the data between all the remaining nodes/osds (coming > from an OSD that has the remaining replica of the pg to the new OSD that > will get a replica). So you move from and to all the remaining osd's and > that will give you a lot of bandwidth and therefor fast recorvery to a > consistent state. Ok, but in this case, 1% is still 36TB of data. There are no difference between 3 nodes with 36TB of data each or 90 nodes with 36TB of data each. In case of a node failure, you always have to move 36TB of data, no matter on how many nodes do you have. -- 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
