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====== ZFS Performance Issues ======

**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.

===== IOStat =====

https://docs.oracle.com/cd/E19253-01/819-5461/gammt/index.html

:!: Statistics are cumulative since boot, so **specify an interval** for more useful stats.

<file>
zpool iostat
zpool iostat 2
zpool iostat -v poolname 1
</file>

===== Solaris 11.4 =====

It's much **faster than OmniOS** with OpenZFS.

===== Why Intel Optane =====

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

===== NVMe Hardware =====

:!: 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

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