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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