Hi Massimiliano,
You’ll need to update the rule with something like that:
rule rep6 {
ruleset 1
type replicated
min_size 6
max_size 6
step take root
step choose firstn 3 type host
step choose firstn 2 type osd
step emit
}
Testing it with crushtool and assuming a crush map with osd0-3 are in host1,
osd4-7 in host2 and osd8-12 in host3 I get the following results
crushtool -i map.bin --test --rule 1 --show-mappings --x 1 --num-rep 6
CRUSH rule 1 x 1 [3,0,9,11,5,7]
Cheers,
Maxime
On 27/02/17 13:22, "ceph-users on behalf of Massimiliano Cuttini"
<[email protected] on behalf of [email protected]> wrote:
Dear all,
i have 3 nodes with 4 OSD each.
And I would like to have 6 replicas.
So 2 replicas for nodes.
Does anybody know how to allow CRUSH to use twice the same node but
different OSD?
Thanks,
Max
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