Ceph uses data replicas, so even if you only use 2 replicas (3 is recommend), you'd basically have best case of the IO of a single drive. You also need to have a minimum of 3 management nodes for Ceph, so personally, I'd stick with local storage if you're focused on speed. You're also running quite a risk by using RAID-0. A single drive failure and you'll lose all of your data. Is there a reason you are using NFS and not just direct local storage?
________________________________ From: Fariborz Navidan <mdvlinqu...@gmail.com> Sent: Tuesday, April 7, 2020 10:36 AM To: users@cloudstack.apache.org <users@cloudstack.apache.org> Subject: I/O speed in local NFS vs local Ceph Hello, I have a single physical host running CloudStack. Primary storage is currently mounted as a NFS share. The underlying filesystem is XFS running on top of Linux Soft RAID-0. The underlying hardware consists of 2 SSD-NVMe drives. The question is that, could I reach faster I/O on VMs if I would use Ceph adding 2 physical devices directly to the cluster and expose it via RBD? How much could it make the I/O faster? Thanks
