this post was submitted on 29 Jun 2026
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Frugal and recycled. Using a mix of old disks in OMV8 with a mergerfs array, suprisingly they amounted to 20TB, so saved a few bob.
If a disk fails in Mergerfs you loose the data on that disk only and not the array as you would with a pure jbod array.
There is a remove disk utility in the OMV8 mergerfs plugin that allows the data from a failing disk to be copied back to the array, if enough space is available, retaining the data from the failing disk. The disk can then be physically removed. If the array is short on space, add a disk to expand the array before removing the failing disk.
I've only ever used it with a failing disk, not a failed disk, I would guess that a backup would be required in that case.
The same applies to mergerfs outside of OMV8, this was easier for me.
I use snapraid for parity on top (OMV7). Works nicely with mergerfs. If a drive fails it can be easily rebuilt. You can use older smaller drives to do split parity (I got 3x 8TB as array and 2x 4TB for parity)