SNIA Podcasts

Storage Developer Conference Podcast Series

Every week the Storage Developer Conference (SDC) podcast series presents important technical topics to the Storage Developer community. Each episode is hand selected by the SNIA Technical Council from the presentations at SDC.

This week’s highlighted Podcast: #134: Best Practices for OpenZFS L2ARC in the Era of NVMe by Ryan McKenzie, Performance Engineer, iX Systems (MP3, Video, PDF of Slides)

The ZFS L2ARC is now more than 10 years old. Over that time, a lot of secret incantations and tribal knowledge have been created by users, testers, developers, and the odd sales or marketing person. That collection of community wisdom informs the use and/or tuning of ZFS L2ARC for certain IO profiles, dataset sizes, server class, share protocols, and device types.

In this talk, we will review a case study in which we tested a few of these L2ARC myths on an NVMe-capable OpenZFS storage appliance. Can high-speed NVMe flash devices keep L2ARC relevant in the face of ever-increasing memory capacity for ARC (primary cache) and all-flash storage pools?

Learning Objectives:
1) Overview of ZFS L2ARC design goals and high level implementation details that pertain to our findings.
2) Performance characteristics of L2ARC during warming and when warmed, plus any tradeoffs or pitfalls with L2ARC in these states.
3) How to leverage NVMe as L2ARC devices to improve performance in a few storage use cases.

The Podcast can be downloaded at iTunes. Download a copy of the original presentation slides as well.



Note: SNIA Podcasts are provided as information only. Articles and guests that appear on any SNIA programs express the opinions, experience, technical positions, and research of those authors and guests and not necessarily those of the SNIA.

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