I've played around with Storage / Pools / Edit Zvol, forcing the "Sync" option on the ZVOL to "Disabled", switched to gzip compression, and of course dedupe is off, but nothing has helped. I see references to disabling write caching on USB devices, but I have the opposite problem - OS X will let me eject the device, so that tells me that OS X considers the iSCSI share as a removable device, and so write caching should be configured conservatively. I suspect that it's a write caching problem, but I can't find any reliable information on dealing with write cache configuration in OS X. However, the best I can consistently sustain on writes is about 75MB/sec, or a quarter of what Windows can do. AJA disk test indicates that the read performance is good, about 500MB/sec, which is fine. However, I can't figure out how to obtain a usable performance on my Mac Pro running 10.11 with XtendSAN to one of these same ZVOLs, formatted as "OS X Extended".
I'm happy with the performance from my other Dell boxes, sustaining a little better than 300MB/sec on writes and 600MB/sec on reads on one of the ZVOL partitions in the NetApp shelf, so we're good there so far.
I've been able to set up a Dell PowerEdge R815 with 72TB of NetApp storage behind it in a RAIDZ3, and share a few ZVOLs to my 10GbE SAN as iSCSI shares. I'm new to FreeNAS, but I've been in the storage and networking infrastructure industry for a couple decades.
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