On Fri, Jun 20, 2014 at 4:23 PM, Shayan Saeed <shayansaee...@gmail.com> wrote: > Is it allowed for crush maps to have multiple hierarchies for different > pools. So for example, I want one pool to treat my cluster as flat with > every host being equal but the other pool to have a more hierarchical idea > as hosts->racks->root?
Yes. It can get complicated, so make sure you know exactly what you're doing, but you can create different "root" buckets and link the OSDs in to each root in different ways. > > Also, is it currently possible in ceph to have a custom placement of erasure > coded chunks. So for example within a pool, I want objects to reside exactly > on the OSDs I choose instead of doing placement for load balancing. Can I > specify something like: "For object 1, I want systematic chunks on rack1 and > non systematic distributed between rack2 and rack3 and then for object 2, I > want systematic ones on rack2 and non systematic distributed between rack1 > and rack3"? Not generally, no — you need to let the CRUSH algorithm place them. You can do things like specify specific buckets within a CRUSH rule, but that applies on a pool level. -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com > > I would greatly appreciate any suggestions I get. > > Regards, > Shayan Saeed > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
