Hello to all, Here is my setup : - 2 racks - osd1 .. osd6 in rack1 - osd7 .. osd12 in rack2 - replica = 2 - CRUSH map set to put replicas accross racks My question : Let's imagine that one day, I need to unplug one of the racks (let's say, rack1). No problem because an other copy of my objects will be in the other rack. But, if i do it, Ceph will start to rebalance data accross OSDs. So, is there a way to put nodes in "Maintenance mode", in order to put Ceph in "degraded" mode, but avoiding any remaping. The idea is to have a command like : $ ceph osd set maintenance=on osd.1 $ ceph osd set maintenance=on osd.2 $ ceph osd set maintenance=on osd.3 $ ceph osd set maintenance=on osd.4 $ ceph osd set maintenance=on osd.5 $ ceph osd set maintenance=on osd.6 So Ceph knows that 6 osds are down, goes into degraded mode, but without remapping data. Then, once maintenance finished, i'll only have to do the opposite : $ ceph osd set maintenance=off osd.1 $ ceph osd set maintenance=off osd.2 $ ceph osd set maintenance=off osd.3 $ ceph osd set maintenance=off osd.4 $ ceph osd set maintenance=off osd.5 $ ceph osd set maintenance=off osd.6 What do you think ? I know that there is a way in Ceph doc to do so with reweight, but it's a little bit complex... What do you think ? Thanks, Alexis -- 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
