I'm setting up a cluster of 2 ESXi hosts, all flash vSAN. Would it make any sense if my datastore SSDs have higher IOPS and throughput than the cache SSD? These are what I plan on getting for each host:
IOPS is what I'm interested in, and the new consumer Samsung 980 pro is twice as fast as the enterprise P4800X. So would this mean the cache SSD will be the bottleneck and the high speeds of the 980 pro will be a waste? Is this a wasteful setup for vSAN?
- cache SSD: Intel 375gb P4800X
seq read: 2400 MB/s
seq write: 2000 MB/s
random read: 550k IOPS
random write: 500k IOPS
latency read/write: 10 µs
edurance: 20.5 PBW
seq write: 2000 MB/s
random read: 550k IOPS
random write: 500k IOPS
latency read/write: 10 µs
edurance: 20.5 PBW
- storage SSD: 3x 2TB Samsung 980 PRO (not launched yet)
seq read: 7000 MB/s
seq write: 5000 MB/s
random read: 1000k IOPS
random write: 1000k IOPS
edurance: 2.4 PBW
seq write: 5000 MB/s
random read: 1000k IOPS
random write: 1000k IOPS
edurance: 2.4 PBW
IOPS is what I'm interested in, and the new consumer Samsung 980 pro is twice as fast as the enterprise P4800X. So would this mean the cache SSD will be the bottleneck and the high speeds of the 980 pro will be a waste? Is this a wasteful setup for vSAN?
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