thanks for your reply,
Yes the VMs are very small and provide only a single service, I would prefer a total of 2TB but 1TB to start is sufficient. Ideally I want a scheme that is easy to expand by dropping an extra disk in each node. When all slots are full, add another node.
our current setup accesses a storage share via NFS, most read/write operations under load are under 4MB. There isn't any long sequential I/O.
Currently we have 2 nodes, I am specing the 3rd and adding necessary components to the existing. Budget around $20k for the upgrade.
On Wed, Apr 4, 2018 at 12:49 PM, Alex Chekholko <alex@xxxxxxxxxxxxxx> wrote:
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@xxxxxxxxxxxxx> wrote:______________________________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 JBOD, and should it be 1gb, 2, or 4gb flash?Storage network will be 10gbe.Enterprise SSDs and Flash-backed raid is very expensive, so I want to ensure the investment will provide best value in terms of capacity, performance, and availability.Thanks,Vincent_________________
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