- Feb 6, 2014
Moreso that non-Optane SSDs have increased read latencies as the write workload ramps up. The L2ARC write limits are there to protect the read latencies from spiking up too badly.3 GB/sec is kinda shorthand for "don't throttle it, and if the SSD doesn't live forever, so be it". Its not a statement of expected data transfer values ;-)
This is likely referring to the "log-based dedup approach" that Matt Ahrens proposed back in 2017:I can't find any reference to it on github, any link about what you are talking about?
It doesn't seem to be part of OpenZFS2.0 nor does it seem to be developed at the moment.
You can underprovision the S3610's down to the same 1.2T and get a bit more effective life out of them if you're really concerned, but given your cold-spare and the costing of them I'd say you're fine as long as you can get the media wearout indicators from SMART, and replace proactively - remember, if they're in mirrors, they're all getting the same amount of writes, so they'll burn out at roughly the same time.The good news is that the S3610 just makes your cutoff at 3 DWPD. The S3710 series does 10, though at a 25% premium over the cost of the 3610 series and the largest drive available in the S3710 series is 1.2TB vs. 1.6TB in the 3610 series.
eBay is filled with these kinds It drives now and for $200 a 1.6TB enterprise-grade drive in a 3-way mirror seems like a ok risk/reward proposition. I may even buy a 4th to have a cold, proven spare here.