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Based on your message, it sounds like your total usable capacity requirement is around <1TB. With a modern SSD, you'll get something like 40k theoretical IOPs for 4k I/O size. You don't mention budget. What is your budget? You mention "4MB operations", where is that requirement coming from? On Wed, Apr 4, 2018 at 12:41 PM, Vincent Royer <vincent at epicenergy.ca>

Hi, Trying to make the most of a limited budget. I need fast I/O for operations under 4MB, and high availability of VMs in an Ovirt cluster. I Have 3 nodes running Ovirt and want to rebuild them with hardware for converging storage. Should I use 2 960GB SSDs in RAID1 in each node, replica 3? Or can I get away with 1 larger SSD per node, JBOD, replica 3? Is a flash-backed Raid required for