[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 at fiberdirekt.se
Sat Oct 7 10:39:53 PDT 2017
On 10/7/2017 7:36 PM, Дробышевский, Владимир wrote:
> 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.
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