On 24/12/2010 18:21, Richard Elling wrote:
Latency is what matters most. While there is a loose relationship between IOPS and latency, you really want low latency. For 15krpm drives, the average latency is 2ms for zero seeks. A decent SSD will beat that by an order of magnitude.
And the closer you get to the CPU, the lower the latency. For example, the DDRdrive X1 is yet another order of magnitude faster because it sits directly on the PCI bus, without the overhead of SAS protocol.
Yet the humble old 15K drive with 2ms sequential latency is still and order of magnitude faster than a busy drive delivering 20ms latencies under a random workload.
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