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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