Yes, you can use a crush rule with two steps: take default chooseleaf indep 5 emit take default chooseleaf indep 2 emit You'll have to adjust it when adding a server, so it's not a great solution. I'm not sure if there's a way to do it without hardcoding the number of servers (I don't think there is). Paul Am Do., 4. Okt. 2018 um 20:28 Uhr schrieb Vladimir Brik <vladimir.brik@xxxxxxxxxxxxxxxx>: > > Hello > > I have a 5-server cluster and I am wondering if it's possible to create > pool that uses k=5 m=2 erasure code. In my experiments, I ended up with > pools whose pgs are stuck in creating+incomplete state even when I > created the erasure code profile with --crush-failure-domain=osd. > > Assuming that what I want to do is possible, will CRUSH distribute > chunks evenly among servers, so that if I need to bring one server down > (e.g. reboot), clients' ability to write or read any object would not be > disrupted? (I guess something would need to ensure that no server holds > more than two chunks of an object) > > Thanks, > > Vlad > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |