ZFS Tunning help in FreeNas

Vengance_01

Supreme [H]ardness
Joined
Dec 23, 2001
Messages
6,110
I have an AIO ESXi 6.7 host running plex and freenas. I am getting terrible read performance.

1-vdev 5x4TB HT Global 5400RPM Cool Spin drives
16GB ram and 2 vcores
H200 pass through in IT mode
Supermicro 1150x mobo

Read I get a solid 300MB/s but write it starts out at 250-300 and falls to 30-40 with 3-5 sec IO pauses. I have ZFS options at default. Client is Win 10 VM on the same host with CIFS aka SMB. Is it forcing sync writes?
 
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