On 5/28/14, 3:51 PM, Dan Swartzendruber wrote: > (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.
If you want IOPS performance out of HDDs, short-stroke the hell out of them. The 76 GB drive should be reduced to something like 2-4 GB so that only the outermost tracks are used. But a good power-protected SSD can nowadays be had for relatively little and will absolutely crush the short-stroked HDD in throughput. Cheers, -- Saso _______________________________________________ OmniOS-discuss mailing list OmniOS-discuss@lists.omniti.com http://lists.omniti.com/mailman/listinfo/omnios-discuss
