> No, pools use crush rulesets.  "straw" and "straw2" are bucket types
> (or algorithms).
> 
> As an example, if you do "ceph osd crush add-bucket foo rack" on
> a cluster with firefly tunables, you will get a new straw bucket.  The
> same after doing "ceph osd crush tunables hammer" will get you a new
> straw2 bucket, with the rest of your buckets remaining unaffected.
> straw buckets are not going to be replaced with straw2 buckets, that's
> something you as an administrator can make a choice to do.

Ah, I see now that 'alg straw' in my crushmap is in the osdXX groups.
What happens if I run
#ceph osd crush tunables hammer
and then add a new OSD?

Thanks again!
Chad.
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