Comment by ryao

5 days ago

You can use different sized disks, but RAID-Z will truncate the space it uses to the lowest common denominator. If you increase the lowest common denominator, RAID-Z should auto-expand to use the additional space. All parity RAID technologies truncate members to the lowest common denominator, rather than just ZFS.

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ryao

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wrboyce  3 days ago

Is it definitely the LCD? Given drive of size 15 and 20 the LCD would be 1, no? I had assumed it would just use the size of the smallest drive on every drive (so 15+20->15+15=30). When I first read your comment I was thinking of GCF but even that would be fairly inefficient (GCF(15,20) = 5, so 15+20->5+5=10).

GauntletWizard  4 days ago

That's not entirely true, Unraid has mechanisms for unbalanced disks, but they come at a high cost in terms of usability by standard workloads.