On Sat, 07 Apr 2018 20:27:49 +0300, "Yaron Daniel" said: > Main items to take into account : > 1) What is the latecny you have between the 2 main sites ? > 2) What network bandwidth between the 2 sites ? > 3) What is the latency to the 3rd site from each site ? > 4) Which protocols plan to be used ? Do you have layer2 between the 2 sites > , or layer 3 ? > 5) Do you plan to use dedicated network for GPFS daemon ?
The answers to most of these questions are a huge "it depends". For instance, the bandwidth needed is dictated by the amount of data being replicated. The cluster I mentioned the other day was filling most of a 10Gbit link while we were importing 5 petabytes of data from our old archive solution, but now often fits its replication needs inside a few hundred mbits/sec. Similarly, the answers to (4) and (5) will depend on what long-haul network infrastructure the customer already has or can purchase. If they have layer 2 capability between the sites, that's an option. If they've just got commodity layer-3, you're designing with layer 3 in mind. If their network has VLAN capability between the sites, or a dedicated link, that will affect the answer for (5). And so on...
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