On Tue, May 12, 2015 at 11:36 PM, Chad William Seys
<cwseys@xxxxxxxxxxxxxxxx> wrote:
>> 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?
OSDs are added into existing buckets, so your new OSD will be added to
an existing straw (or whatever other you might have) bucket of your
choosing. Unless you create a new bucket for that OSD that is.
Thanks,
Ilya
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