Great summary for virtualization: https://youtu.be/fo3EGuCszpE

Only for VM storage or databases do you need or want to enable sync.

If you simply use ZFS without foreign filesystems on it (VMs), ZFS will never corrupt on a crash due Copy On Write. So for regular filer use, disable sync unless you want a maximal security for small files like on a mailserver.

zpool iostat
zpool iostat -v 1
zpool iostat -v poolname 1

It's much faster than OmniOS with OpenZFS.

It's crazy not to unless you don't have NVMe or PCIe slot!

https://forums.servethehome.com/index.php?threads/intel-optane-32g-800p-900p-for-zfs-pools-and-slog-on-solaris-and-omnios.19810/

http://napp-it.org/doc/downloads/optane_slog_pool_performane.pdf

PCIe 3.0 x8 low-profile card

Mount two M.2 800P as mirrored SLOG:

https://www.supermicro.nl/products/accessories/addon/AOC-SLG3-2M2.cfm