Good evening,

with the last update it's possible to move from USB to the internal boot.

I have a cache with 2 m2ssd btrfs and raid mirror.

Is it possible to remove 1 ssd from the cache pool and then create there the boot device and after that move the data to the boot devices.

And after that add the 2. ssd as mirror to the boot pool or is this not possible?

@JorgeB Can you take a look at the steps I laid out below and give you input on this? In theory this should work but I dont want to accidentally give any bad advice.

@daschmidt These are the steps I believe will achieve what you are asking. However I would caution you to wait to see if Jorge has any critiques or concerns before attempting.

Note: you will not be able to use the same pool name since unraid does not allow two pools with identical names. If you want to keep the pool name the same you will need to migrate the data onto the array and then remove the pool entirely.

If you want to use a different pool name, you should be able to follow the steps below:

1. Follow the procedure here to remove one of the drives from the pool.

2. Once the drive has been safely removed from the pool, you can create the new boot pool with the single drive using the onboarding wizard. (make sure you pick boot+data option) Cant name it the same as your Then reboot.

3. After the reboot from creating and booting off the single new boot disk, copy the data from the existing pool to your newly created data partition on your boot pool. (I would consider copying it to the array instead)

4. Stop the array again and with the array stopped you can click on the drop-down and make the boot pool 2-disks wide. Add the 2nd disk, select the data partition name, make sure it's btrfs mirror. Start the array.

5. With the array started you will want to click the name of the pool again, and click on "Balance" this should mirror the data between the two disks and get you back to a protected state.

Edit: Step #5 is not needed as unraid will automatically do the balance when a 2nd drive is added.

Edited May 25May 25 by MowMdown

5 hours ago, MowMdown said:

Stop the array again and with the array stopped you can click on the drop-down and make the boot pool 2-disks wide. Add the 2nd disk, select the data partition name, make sure it's btrfs mirror. Start the array.

Are you sure with btrfs? In the docs there is only zfs listet

Can I configure internal boot with two SSDs in a mirrored setup for redundancy?

Yes. Mirrored internal boot is supported by default.

Internal boot uses ZFS, and a mirrored setup uses a ZFS mirror for redundancy. If one boot drive fails, Unraid continues running in a degraded state. Replace the failed device through the normal Unraid drive assignment flow to restore the mirror

If the pool is really a mirror you can follow the steps above, if you are not sure, post the diagnostics.

7 hours ago, MowMdown said:

With the array started you will want to click the name of the pool again, and click on "Balance" this should mirror the data between the two disks and get you back to a protected state.

This step is not needed; a mirror is automatically created once you add a 2nd device.

at the moment it looks like this. I give it a try in the evening.