Hi All I am struggling to gain information relating to whether Ceph without SSD drives will give sufficient performance in my planned infrastructure refresh using Openstack. I was keen to go with Ceph, with its support in Openstack and Ubuntu, but it has been suggested that a SAN solution would provide better performance. Unfortunate, since I have a limited budget, I cannot consider the Ceph Enterprise route at present.
Planned infrastructure - 2 x Hardware load balancer 2 x Controller nodes [would run a Ceph MON on each] -- Dual CPU, 32Gb RAM, 4 x 600gb SAS 10k drives 2 x Compute nodes [ could run a Ceph MON on one of these] -- Dual CPU, 256gb RAM, 4 x 600gb SAS 10k drives EITHER SAN or if Ceph, the storage servers would be 2 x R70xd with dual CPU, 64Gb RAM, 24 x 600gb SAS 10k drives, each drive as RAID0 with write back cache on controller. each of these drives would have a partition for the journals. Network is all 10gbe I have a couple of Dell 2950 with only 1gb network ports and could consider these for the Ceph MONs. This setup would need to be able to run about 80-100 VMs running web based applications, each is stateless but boot from block storage and each would be using 2-4gb RAM and 20Gb volumes. I have read lots fo information on the internet and raised questions on various forums and have seen positive and negative feedback on Ceph performance without SSDs. This has confused me as I am unsure whether using Ceph is appropriate for my requirements. NOTE, I would be willing to reduce quantity of drives on the storage server - say 8-12 x 1TB as also read that performance can be better with lower quantity of drives per host. Regards Ian
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