(merging comments to Saso and Jim) I don't think I mentioned my environment - if not, my apologies. This is a SOHO/Lab setup, so things like zeusram are non-starters. The basic network infrastructure is gigabit, so iSCSI ZIL would suck badly, I suspect. As far as over-provisioning the 840PRO, I have it sliced for 16GB. Once it's been running for awhile, I will re-run the disk benchmark. I understand the 840PRO doesn't have a supercap - this was basically just a performance analysis to see how it stacks up compared to sync=disabled and on-pool ZIL. If I go this route, I will need to look for a decent/affordable unit with supercap. One other test I can try is with a 15K 76GB SAS 2.5-inch drive I salvaged from a dead server. It should have about 1/2 the latency of a 7200rpm sata drive, and if so would get me up to about 40MB/sec, which is still not good, but better than on-pool ZIL. I'll find out later. I have googled a fair amount and there seems to be 'work in progress' for TRIM support for ZoL and illumos, but no real indication I could find as to when either might support it.
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