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Forum Discussion
Pro 6 not expanding with 6TB drive swap
I've got a ReadyNAS Pro 6 populated with 6 x 3TB hard drives. I'm at max capacity so I swapped out one of the drives with a new 6TB model. The Volume successfully repaired itself, but RAIDiator (4....
First of all, you won't see any expansion with xraid/raid-5 until you install two drives of the larger capacity.
Second of all, the expansion limits of 4.2.x are a bit more complicated than you are thinking.
(a) installing 6x4TB (or even 6x6TB) and doing a factory default will work ok.
(b) Installing 2x6TB+4x3TB and doing a factory reset will not work ok. The issue is that a volume cannot expand over the 16 TiB threshold, and in this case xraid first sets up a 6x3TB and then tries to expand. (This config has a 16.37 TiB volume size - slightly over the limit). Replacing two 3 TB drives with 6 TB models will similarly fail to expand.
(c) A volume cannot expand more than 8 TiB larger than its starting point (initial install or last factory reset).
So you might well be at an expansion limit on this pro. And mixed drive sizes are limited to a 16 TiB volume.
Second of all, the expansion limits of 4.2.x are a bit more complicated than you are thinking.
(a) installing 6x4TB (or even 6x6TB) and doing a factory default will work ok.
(b) Installing 2x6TB+4x3TB and doing a factory reset will not work ok. The issue is that a volume cannot expand over the 16 TiB threshold, and in this case xraid first sets up a 6x3TB and then tries to expand. (This config has a 16.37 TiB volume size - slightly over the limit). Replacing two 3 TB drives with 6 TB models will similarly fail to expand.
(c) A volume cannot expand more than 8 TiB larger than its starting point (initial install or last factory reset).
So you might well be at an expansion limit on this pro. And mixed drive sizes are limited to a 16 TiB volume.
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