[ceph-users] Re: Default erasure code profile not working for 3 node cluster?

Danny, Levin, Thanks, both your answers helped (and are exactly what I suspected was the case). Looking back at the documentation I can see where my confusion began, as it isn't clear there that the "simplest" and "default" erasure code profiles are different. I'll report a documentation bug

[ceph-users] Re: Default erasure code profile not working for 3 node cluster?

The only thing I can see from your setup is you've not set a failure domain in your crush rule, so it would default to host. And a 2/2 erasure code wouldn't work in that scenario as each stripe of the EC must be in it's own failure domain. If you wanted it to work with that setup you'd need

[ceph-users] Re: Default erasure code profile not working for 3 node cluster?

Hi Mark, K=2 + M=2 EC profile with set to host failure domain will require at least 4 node. “The simplest erasure coded pool is equivalent to RAID5 and requires at least three hosts:”. This is assume your EC Profile is K=2+M=1 which