perhaps group sets of hosts into racks in crushmap. The crushmap doesn't
have to strictly map the real world.
On 05/13/2014 08:52 AM, Cao, Buddy wrote:
>
> Hi,
>
> I have a crushmap structure likes root->rack->host->osds. I designed
> the rule below, since I used "chooseleaf...rack" in rule definition,
> if there is only one rack in the cluster, the ceph gps will always
> stay at stuck unclean state (that is because the default
> metadata/data/rbd pool set 2 replicas). Could you let me know how do I
> configure the rule to let it can also work in a cluster with only one
> rack?
>
> rule ssd{
>
> ruleset 1
>
> type replicated
>
> min_size 0
>
> max_size 10
>
> step take root
>
> step chooseleaf firstn 0 type rack
>
> step emit
>
> }
>
> BTW, if I add a new rack into the crushmap, the pg status will finally
> get to active+clean. However, my customer do ONLY have one rack in
> their env, so hard for me to have workaround to ask him setup several
> racks.
>
> Wei Cao (Buddy)
>
>
>
> _______________________________________________
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> ceph-users at lists.ceph.com
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