Hi, We are looking at extending one of our Ceph clusters, currently running Luminous. The cluster is all SSD, providing RBD to Openstack, using 70 OSDs on 5 hosts.
We have a couple of projects kicking off that will need significantly more, albeit slower storage. I am looking at speccing out some new OSD nodes with higher capacity spinning drives. We are deploying 25GbE these days, so I am not worried about network bandwidth (and have taken on recent comments suggesting that there is no reason to run separate cluster/public networks. What about CPUs - is it still worth 2x CPUs? Our current OSD hosts have 2x CPUs but neither seems particularly busy. Would a single higher spec CPU win out over dual lower spec CPUs, taking on board previous discussion that GHz is king. SSD/NVMe for WAL etc? We're running Bluestore on all of our SSD OSDS with colocated WAL. We are looking to provide ~500TB into a separate (non-default) storage pool, and so would appreciate suggestions about where my money should be going (or not going).
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