Hi,

On 04/05/18 08:25, Tracy Reed wrote:
> On Fri, May 04, 2018 at 12:18:15AM PDT, Tracy Reed spake thusly:
>> https://jcftang.github.io/2012/09/06/going-from-replicating-across-osds-to-replicating-across-hosts-in-a-ceph-cluster/
> <snip>
>> How can I tell which way mine is configured? I could post the whole
>> crushmap if necessary but it's a bit large to copy and paste.
> 
> To further answer my own question (sorry for the spam) the above linked
> doc says this should do what I want:
> 
>         step chooseleaf firstn 0 type host
> 
> which is what I already have in my crush map. So it looks like the
> default is as I want it. In which case I wonder why I had the problem
> previously... I guess the only way to know for sure is to stop one osd
> node and see what happens.

You can ask ceph which OSDs a particular pg is on:

root@sto-1-1:~# ceph pg map 71.983
osdmap e435728 pg 71.983 (71.983) -> up [1948,2984,511] acting
[1948,2984,511]

...then you can check these are on different hosts.

HTH,

Matthew

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