Comments on: Six Metrics for Measuring ZFS Pool Performance Part 2

By: Rowan Davies

Rowan Davies — Mon, 04 Jan 2021 07:23:27 +0000

In Scenario 3, I’d suggest that mirrored vdevs will actually decrease the streaming write speeds compared to RAID-Z2. They will only slightly increase the streaming read speeds compared to RAID-Z2. So overall it’s likely to be worse, unless the number of small (sub-block) IOPS is the limiting factor, in which case the streaming performance is less relevant.

By: Kris

Kris — Mon, 01 Jul 2019 19:42:33 +0000

if i do 3x 6-wide Z2 does iops increase to 3×250 = 750 ?

By: Jeff Hallam

Jeff Hallam — Sat, 20 Oct 2018 12:04:50 +0000

In reply to Joon Lee. Fantastic.

By: Joon Lee

Joon Lee — Wed, 17 Oct 2018 21:46:28 +0000

In reply to Jeff.

Click on the “white paper” link up above or go here: https://static.ixsystems.co/uploads/2018/10/ZFS_Storage_Pool_Layout_White_Paper_WEB.pdf

By: Joon Lee

Joon Lee — Wed, 17 Oct 2018 21:45:06 +0000

In reply to Dirk Achenbach. Thank you for the support.

By: Jeff

Jeff — Sat, 13 Oct 2018 00:05:40 +0000

The performance comparisons are great; very useful. Consider a downloadable PDF link for your writeup?

By: Dirk Achenbach

Dirk Achenbach — Tue, 09 Oct 2018 15:20:35 +0000

This is brilliant, many thanks.

By: Emi

Emi — Wed, 03 Oct 2018 04:27:51 +0000

Nice write up, I especially liked the probability calculator part.
Thanks!