Does ZFS Damage SSDs? Testing Write Amplification
Exploring whether ZFS causes SSD wear or write amplification, and how to configure settings to prevent damage. 🔧

ElectronicsWizardry
66.3K views • Feb 8, 2025

About this video
I often see questions asked if ZFS causes write amplification or kills SSDs. In this video I look into this and see if its true, and what ZFS settings can be used to change the amount of write amplification ZFS does.
I tried to get as much correct as I could about how ZFS works under the hood, but ZFS can be complex under the hood. I also tried to balance explaining enough so viewers can get the why of some of the settings with keeping a reasonable video length, but let me know if there are changes you would like to see.
Scripts and Raw data are on my Github here: https://github.com/ElectronicsWizardry/ZFSWriteAmplificationTests
00:00 Intro
00:34 Testing methodology and initial test
02:09 ZFS RAID effects
04:26 ZFS Sync
07:56 ZFS ashift
11:25 One final test
13:03 Conclusion
I tried to get as much correct as I could about how ZFS works under the hood, but ZFS can be complex under the hood. I also tried to balance explaining enough so viewers can get the why of some of the settings with keeping a reasonable video length, but let me know if there are changes you would like to see.
Scripts and Raw data are on my Github here: https://github.com/ElectronicsWizardry/ZFSWriteAmplificationTests
00:00 Intro
00:34 Testing methodology and initial test
02:09 ZFS RAID effects
04:26 ZFS Sync
07:56 ZFS ashift
11:25 One final test
13:03 Conclusion
Video Information
Views
66.3K
Likes
3.1K
Duration
13:30
Published
Feb 8, 2025
User Reviews
4.7
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