You could create a new root bucket which contains hosts 2 and 3; then use it instead of "default" in your special rule. That's probably what you want anyway (rather than potentially having two copies of the data on host 1). -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com On Tue, Jul 29, 2014 at 10:10 AM, Szymon Zacher <szzacher at gmail.com> wrote: > I have 3 osd on 3 different hosts: host1 host2 and host3. I'm trying to > force CRUSH to use osd on host1 as primary for one of my pools. I can't use > primary-affinity because i don't want to set this osd as primary for all my > pools. I try to create simple CRUSH rule, which should select osd on host1 > first (as primary) and then get rest of acting set randomly: > > rule primary_on_host_1 { > ruleset 1 > type replicated > min_size 1 > max_size 10 > step take host1 > step choose firstn 1 type osd > step emit > step take default > step chooseleaf firstn -1 type host > step emit > } > > unfortunately when CRUSH uses this rule sometimes returns duplicated osd in > acting set like: > > CRUSH rule 1 x 28 [0,0,2] > CRUSH rule 1 x 29 [0,2,0] > CRUSH rule 1 x 30 [0,0,1] > > Is there any other way how can I force ceph to use one specific osd as > primary? > -- > Szymon Zacher > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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