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root@FreeNAS:/mnt/ztank # uname -imr
11.1-STABLE amd64 FREENAS64
root@FreeNAS:/mnt/ztank # zpool status ztank
pool: ztank
state: ONLINE
scan: scrub repaired 0 in 0 days 13:09:46 with 0 errors on Tue Feb 13 11:55:49 2018
config:
NAME STATE READ WRITE CKSUM
ztank ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gptid/99fa76e2-ed5f-494d-97de-f97a80287033 ONLINE 0 0 0
gptid/92b591c1-3ebe-d34e-b5f0-57a746c5fbf3 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
gptid/6fd8c2d0-7b50-074d-9070-3c7f482b8f27 ONLINE 0 0 0
gptid/9b215566-639f-3c43-995f-6bc4dc308963 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
gptid/7249eb5e-9ef9-8747-b17a-88a0afd23260 ONLINE 0 0 0
gptid/99d6ca9c-dced-2a47-ba10-0382851deaad ONLINE 0 0 0
mirror-3 ONLINE 0 0 0
gptid/8e377a23-7832-f24e-9b97-1512c3bc1c89 ONLINE 0 0 0
gptid/4ef4837c-9e04-e844-a6f7-52c7d309b0f9 ONLINE 0 0 0
errors: No known data errors
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root@FreeNAS:/mnt/ztank # time dd if=/dev/zero of=/mnt/ztank/speedtest bs=131072 count=4096
4096+0 records in
4096+0 records out
536870912 bytes transferred in 0.481297 secs (1115466481 bytes/sec)
0.000u 0.392s 0:00.48 81.2% 30+174k 0+4096io 0pf+0w
root@FreeNAS:/mnt/ztank # time dd if=/dev/zero of=/mnt/ztank/speedtest bs=512 count=1048576
1048576+0 records in
1048576+0 records out
536870912 bytes transferred in 6.059399 secs (88601352 bytes/sec)
0.133u 5.883s 0:06.06 99.1% 30+173k 0+1048576io 0pf+0w
root@FreeNAS:/mnt/ztank #
½ a second and 6 seconds!! obviously this is staying in ARC… so what's ZFS doing on macOS then?
This test is on an old X58 mobo with a 3GHz QC Xeon and 24GB RAM… (pool uses 4TB Seagate connected to a RR2744)
This is the same hardware that was running macOS 10.13.2 a week ago… but I'm getting > 700MB/sec over my network again...