[ceph-users] PGs get placed in the same datacenter (Trying to make a hybrid NVMe/HDD pool with 6 servers, 2 in each datacenter)

Peter Linder peter.linder at fiberdirekt.se
Sat Oct 7 10:39:53 PDT 2017


On 10/7/2017 7:36 PM, Дробышевский, Владимир wrote:
> Hello!
>
> 2017-10-07 19:12 GMT+05:00 Peter Linder <peter.linder at fiberdirekt.se
> <mailto:peter.linder at fiberdirekt.se>>:
>
>     The idea is to select an nvme osd, and
>     then select the rest from hdd osds in different datacenters (see crush
>     map below for hierarchy). 
>
> It's a little bit aside of the question, but why do you want to mix
> SSDs and HDDs in the same pool? Do you have read-intensive workload
> and going to use primary-affinity to get all reads from nvme?
>  
>
Yes, this is pretty much the idea, getting the performance from NVMe
reads, while still maintaining triple redundancy and a reasonable cost.


> -- 
> Regards,
> Vladimir


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