dear all, I have 4 servers to realize the "block storage" for my OpenStack . Which topology is the best to balance the three requirements in subject ?
For example , I can configure the nodes as a linked list , which allows me to have a good fault tolerance : two non-adjacent nodes can fail without interrupting service, I spend half of the available space, but what about performance ? Or if I try with dispersed volume in RAID5-like is it faster than a linked list (obviously I gain space, but a single node could fail) ? Which kind of parameters do I need to considered for this problem ? Can I apply the same ideas that apply to a hardware raid ( http://en.wikipedia.org/wiki/Standard_RAID_levels) ? Are there any other topologies that I can imagine with only 4 nodes (i.e. RAID10-like with dispersed volume) ? BR M.
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