Just think about it: 1 GE NIC will give you ~120 GB/s troughput so it will saturate single HDD 7,200 RPM. When you have parallel R/W to it node at few HDD in the same time, NIC saturation will be easier ;) When you add SSD as hot tier you lose much their capability. Think about used InfiniBand stuff instead of 10GE. You will get RDMA (Gluster support it) and lower latency in less price. Regards, Bartosz
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