MacPro 2012, booted macOS 10.14 from PCIe HBA capable of r/w of ~1500MB/sec, 32GB RAM with 100% stock install of 1.80:
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cMacPro:~ madmin$ kextstat | grep lundman
149 1 0 0x498 0x498 net.lundman.kernel.dependencies.31 (12.5.0) DF83AD37-501E-3B4F-B1F0-04F3AC90FE35
150 1 0xffffff7f835a7000 0x11f5000 0x11f5000 net.lundman.spl (1.8.0) 8961EE38-B08D-39A2-BBB6-FC4C110B3241 <149 7 5 4 3 1>
151 1 0xffffff7f8479c000 0x2db000 0x2db000 net.lundman.zfs (1.8.0) 043E6807-1605-359A-80E8-0E0BF1C2DC3F <150 25 7 5 4 3 1>
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cMacPro:~ madmin$ time cp /Users/madmin/Desktop/8047312422.zip /Volumes/sammy
real 1m32.445s
user 0m0.021s
sys 0m11.346s
92 seconds to copy over 8GB to pool ~ 83MB/sec average…
The pool sammy is 5 x Samsung 1TB 3.5" 7500rpm SATA disks using the 5 of the 6 MacPro SATA connectors in a raidz1 config.
Speeds do fluctuate up to 480MB/sec which is about the maximum throughput of these disks.
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---------------------------------------------- ----- ----- ----- ----- ----- -----
capacity operations bandwidth
pool alloc free read write read write
---------------------------------------------- ----- ----- ----- ----- ----- -----
sammy 2.60G 4.53T 0 5.25K 0 485M
raidz1 2.60G 4.53T 0 5.25K 0 485M
media-98AFF870-0D92-7D4B-B4F1-9890A513617F - - 0 971 0 97.4M
media-0E563C42-BF48-8545-8A6A-6AFA1F72C067 - - 0 1.30K 0 97.6M
media-C2379B31-8AE6-7845-8736-4086C16AC9C8 - - 0 1.14K 0 98.5M
media-769426EB-FE69-AE47-9F06-EF22D84F1992 - - 0 1011 0 96.6M
media-2E9CEA06-9033-1940-9A66-1088EADF0452 - - 0 892 0 95.2M
---------------------------------------------- ----- ----- ----- ----- ----- -----
By comparison, the same file transferred from PCIe HBA to a single SATA SSD installed on the same SATA bus:
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cMacPro:~ madmin$ time cp /Users/madmin/Desktop/8047312422.zip /Volumes/1TB\ SSD
real 0m29.472s
user 0m0.020s
sys 0m4.133s
cMacPro:~ madmin$
gives ~256MB/sec average
Massive difference.
I can't use ZFS on macOS with these speeds… it hurts too much when the same hardware with FreeNAS/Linux is 3 times faster.