# How to Migrate a ZFS Root Pool and Boot System to a New Disk

🪛 Goal

Migrate boot system and ZFS root pool from one disk to another, preserving bootability and data integrity.

Dont forget to Keep a rescue USB handy in case you need to recover the bootloader.

**1. Partition the New Disk:**

*Identify disks using lsblk or fdisk -l. and recreate partitions.*


**2. Format the EFI Partition:**

if using UEFI boot:

*Exemple using proxmox host os:*

``` bash
proxmox-boot-tool format /dev/sdY2*
```

**3. Attach New Disk to ZFS Pool:**

*This will mirror the pool temporarily:*

``` bash
zpool attach rpool /dev/sdX3 /dev/sdY3
```

**4. Wait for Resilvering:**

*Monitor progress:*

``` bash
zpool status rpool
```

**5. Detach Old Disk:**

``` bash
zpool detach rpool /dev/sdX3
```

**5. Update Boot Order:**

*Ensure your BIOS/UEFI is set to boot from the new disk.*

🧠 Notes

If you don’t want to mirror temporarily, you can also:

- Create a new ZFS pool on the new disk.
- Use zfs send | zfs receive to migrate datasets.
- Reconfigure bootloader manually.