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

ElectronicsWizardry
66.3K views β’ 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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