Jeroen Roodhart wrote:
The thread was started to get insight in behaviour of the F20 as ZIL. _My_ particular interest would be to be able to answer why perfomance doesn't seem to scale up when adding vmod-s...
My best guess would be latency. If you are latency bound, adding additional parallel devices with the same latency will make no difference. It will improve throughput, but may actually make latency worse (additional time to select which parallel device to use).
But one of the ZFS gurus may be able to provide a better answer, or some dtrace foo to confirm/deny my thesis.
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