Andrija, You can use a single pool and the proper CRUSH rule step chooseleaf firstn 0 type host to accomplish your goal. http://ceph.com/docs/master/rados/operations/crush-map/ Cheers, Mike Dawson On 10/16/2013 5:16 PM, Andrija Panic wrote:
Hi, I have 2 x 2TB disks, in 3 servers, so total of 6 disks... I have deployed total of 6 OSDs. ie: host1 = osd.0 and osd.1 host2 = osd.2 and osd.3 host4 = osd.4 and osd.5 Now, since I will have total of 3 replica (original + 2 replicas), I want my replica placement to be such, that I don't end up having 2 replicas on 1 host (replica on osd0, osd1 (both on host1) and replica on osd2. I want all 3 replicas spread on different hosts... I know this is to be done via crush maps, but I'm not sure if it would be better to have 2 pools, 1 pool on osd0,2,4 and and another pool on osd1,3,5. If possible, I would want only 1 pool, spread across all 6 OSDs, but with data placement such, that I don't end up having 2 replicas on 1 host...not sure if this is possible at all... Is that possible, or maybe I should go for RAID0 in each server (2 x 2Tb = 4TB for osd0) or maybe JBOD (1 volume, so 1 OSD per host) ? Any suggesting about best practice ? Regards, -- Andrija Panić _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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