When the filesystem is under heavy load, eg, a big finder copy of data, the performance varies a lot, even if I try the same copy over and over, from 30Mb/sec up to 180Mb/sec. That is acceptable. What isn't acceptable is the UI getting jerky. Usually it is just a slightly jerky mouse, but sometimes it is freezing for 5-10 seconds at a time.
My setup is a Retina 5K imac with 4 GHz i7, and 32GB ram. The physical disks are external 6TB USB3 disks. Some info about the zpool is below. I only added the cache and log (partitions of an ssd) to see if they would help resolve my issue. They did not. Has anyone else experienced this sort of UI lag? If I can't find a solution, I may have to abandon ZFS.
Thanks in advance for your help!
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zpool list -v
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
zdisk 16.2T 703G 15.6T - 0% 4% 1.00x ONLINE -
raidz1 16.2T 703G 15.6T - 0% 4%
media-4B22B045-90DE-D649-AFAD-2BF80FA3B606 - - - - - -
media-7170E987-EA50-1347-92F2-AC2252E59E9F - - - - - -
media-FD3133BE-ED42-054F-857F-A93945161DD9 - - - - - -
cache - - - - - -
media-4B22B045-90DE-D649-AFAD-2BF80FA3B606 - - - - - -
media-7170E987-EA50-1347-92F2-AC2252E59E9F - - - - - -
media-FD3133BE-ED42-054F-857F-A93945161DD9 - - - - - -
log - - - - - -
disk0s6 12.8G 0 12.8G - 0% 0%
cache - - - - - -
disk0s4 79.2G 175M 79.1G - 0% 0%
cache - - - - - -
disk0s4 79.2G 175M 79.1G - 0% 0%
(I don't know why cache disk0s4 appears twice)
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$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
zdisk 10.5T 8.07G 23.5M /Volumes/zdisk
zdisk/11TB 10.5T 10.0T 468G -