---
title: "Migrating a ZFS pool from RAIDZ1 to RAIDZ2"
url: https://daily.dev/posts/migrating-a-zfs-pool-from-raidz1-to-raidz2-8zqwtxxbc
source_url: https://mtlynch.io/raidz1-to-raidz2/
type: article
source: "Michael Lynch"
published: 2025-07-23T14:44:50.503Z
updated: 2026-07-02T02:14:42.707Z
tags: ["homelab", "linux", "storage", "truenas"]
reading_time: 24
upvotes: 2
comments: 0
language: en
---

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# Migrating a ZFS pool from RAIDZ1 to RAIDZ2

**[Michael Lynch](https://daily.dev/sources/mtlynch)** · 24 min read · 2 upvotes · 0 comments

## Summary

A detailed walkthrough of migrating 18 TB of data from a 4-disk RAIDZ1 ZFS pool to a 7-disk RAIDZ2 pool using only three additional disks. The process involves creating a temporary RAIDZ2 pool with a sparse file as a fake disk, migrating data using ZFS snapshots, destroying the old pool, and expanding the new pool with the remaining disks. The migration leverages ZFS's new RAIDZ expansion feature available in OpenZFS 2.3.0 and TrueNAS 25.04.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://mtlynch.io/raidz1-to-raidz2/>

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---

Tags: [#homelab](https://daily.dev/tags/homelab), [#linux](https://daily.dev/tags/linux), [#storage](https://daily.dev/tags/storage), [#truenas](https://daily.dev/tags/truenas)

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