As it currently stands I have an array with my parity disk as a 12tb drive and data disks are two 6tb drives. I recently procured another 12tb drive, how can I change one of the 6tb drives to parity so I can add the new drive to the array and have 18tb of storage?

Thanks

If I'm understanding what you are asking correctly, that's not possible; parity drives must be the same size or larger than any individual data drives.

@hyphonetics

There are 2 possibilities to increase available storage that you might want to consider:

• Add the new 12TB drive replacing a 6TB drive increasing the total available space by 6TB to give 18TB.

• Add the new 12TB drive as an additional data drive (i.e.disk3) increasing the total available space by 12TB to give 24TB.

On 6/18/2026 at 3:40 AM, itimpi said:

@hyphonetics

There are 2 possibilities to increase available storage that you might want to consider:

• Add the new 12TB drive replacing a 6TB drive increasing the total available space by 6TB to give 18TB.

• Add the new 12TB drive as an additional data drive (i.e.disk3) increasing the total available space by 12TB to give 24TB.

I stopped my array, changed a data disk from a 6tb to a 12tb, so now the data array is 6tb & 12tb, data is currently rebuilding.

After that is done, the now unallocated 6tb disk will get added back as a parity drive.

Thanks for the help!

Edited June 21Jun 21 by hyphonetics

That won’t be the case

Parity must be equal to or larger than ur biggest data disk , as you have added a 12tb data disk, parity disk must be 12tb or larger so you will be blocked from adding the 6tb as parity , you could however add it as a data disk

5 hours ago, hyphonetics said:

After that is done, the now unallocated 6tb disk will get added back as a parity drive.

as already explained

On 6/18/2026 at 3:27 AM, JorgeB said:

that's not possible; parity drives must be the same size or larger than any individual data drives.