Re: Crush rule examples

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> Sorry, sent too early. So here we go again:
>   My setup looks like this:
>
>        DC1
>            node01
>            node02
>            node03
>            node04
>            node05
>        DC2
>            node06
>            node07
>            node08
>            node09
>            node10
>
> I want a replicated pool with size=4. Two copies should go in each DC,
> and then no two copies on a single node.
> How can I describe this in a crush rule?

This post seem to show that, except they have their root named "nvme"
and they split on rack and not dc, but that is not important.

https://unix.stackexchange.com/questions/781250/ceph-crush-rules-explanation-for-multiroom-racks-setup

with the answer at the bottom:

for example this should work as well, to have 4 replicas in total,
distributed across two racks:
step take default class nvme
step choose firstn 2 type rack
step chooseleaf firstn 2 type host

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