Ok, I have just about given up on this one, and I was so hopeful after
having figured out the read performance issue (which to recap was a
mix of ESX guest network latency and a randomizing of the data file
from running random write and sequential read tests back to back).
Now it seems I am up against the hardware and ZIL on this one.
To make it short, 4k sequential writes, throughput 16MB/s...
Local tests show hardware is capable of at least 132MB/s (3 raidz
groups of 4 disks each, those are 15K SAS disks).
I believe the network is tuned optimally, Nagle on Windows disabled.
The ZIL is going to a 16GB Mtron SSD, 100us sequential access time.
Any more suggestions or pointers to improve things are warmly welcomed.
-Ross
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