Thanks for the reply shylesh, but the procedure is not working. In ceph.com it is mentioned that we can make particular osd as a primary osd by setting primary affinity weightage between 0-1. But it is not working.
On 14 Jun 2016 16:15, "shylesh kumar" <shylesh.mohan@xxxxxxxxx> wrote:
Hi,I think you can edit the crush rule something like belowrule another_replicated_ruleset {
ruleset 1
type replicated
min_size 1
max_size 10
step take default
step take osd1
step choose firstn 1 type osd
step emit
step take osd2
step choose firstn 1 type osd
step emit
step take osd5
step choose firstn 1 type osd
step emit
step take osd4
step choose firstn 1 type osd
step emit
}and create pool using this rule.It might work , though I am not 100% sure.Thanks,ShyleshOn Tue, Jun 14, 2016 at 4:05 PM, Kanchana. P <kanchanareddyp@xxxxxxxxxx> wrote:Hi,
How to select particular OSD to act as primary OSD.
I modified the ceph.conf file and added
[mon]
...
mon osd allow primary affinity = true
Restarted ceph target, now primary affinity is set to true in all monitor nodes.
Using the below commands set some weights to the osds.
$ ceph osd primary-affinity osd.1 0.25
$ ceph osd primary-affinity osd.6 0.50
$ ceph osd primary-affinity osd.11 0.75
$ ceph osd primary-affinity osd.16 1
Created a pool "poolA" and set a crush_ruleset so that it takes OSDs in order 16,11,6,1
Even after setting the primary affinity weight, it took osds in different order.
Can we select the primary OSD, if so, how can we do that. Please let me know what I am missing here to set an OSD as a primary OSD.
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--Thanks & Regards
Shylesh Kumar M
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