4 ms·

Note that the 8TB model has about 50TB of cache (quite a bit more than the 1TB model—it doubles in size with each doubling of storage capacity). One concern We

Note that the 8TB model has about 50TB of cache (quite a bit more than the 1TB model—it doubles in size with each doubling of storage capacity). One concern Wendell had with RAIDZ2 was the potential for the older Xeon to be a bottleneck for writes. It probably wouldn't be, but I didn't do too much testing with that layout. I might still, we'll see.

mrb 4y ago
For reference, my server CPU is an AMD Ryzen 7 PRO 5750G (65W TDP, 3.8-4.6GHz, 8-core, 16-threads) and CPU usage is around 8% when writing at 700 MB/s on my raidz2. In other words, only a little more than 1 of the 16 hardware threads is utilized to handle this workload. Your older Xeon D-1521 should be able to handle that, but it's true that being an older processor, it is pushing it closer to its limits. Handling concurrently 10 Gb/s of network traffic would likely push it to more than 50% utilization. That's one reason I like to not cheap out too much on the CPU, especially for a 10GbE ZFS NAS.