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Solved
ReadyNAS 628 expansion not starting
ReadyNAS 628x running firmware 6.10.8 in RAID6 NAS has operated flawlessly for many years with eight (8) 14TB drives. A recent drive failure led me upgrade to: Four (4) 14TB drives F...
I should have mentioned the volume is encrypted
Encrypted volumes can't be vertically expanded, so you'll need to destroy the volume and start over in order to use all the space.
If I recreate the encrypted volume, will the 4x14TB plus 4x24TB drives result in a (6x14TB) volume or a (4x14TB)+(2x24TB)volume?
First, an unencrypted RAID-6 volume would have a volume size of 104 TB (~94.6 TiB). There would be two RAID groups - 8*14TB spanning all disks, and 4*10TB using the remaining space on the 24 TB drives. So capacity would be 6*14 + 2*10.
I am not sure what would happen if you encrypted the volume. You mght get the same 104 TB, but I am thinking it is more likely that you'd end up with 84 TB instead (same as you have now).
A more predictable path would be to set up two RAID-5 volumes - 4x14TB and 4x24TB. Those could each be encrypted, and the capacities would be 42 TB and 72 TB respectively (114 TB total).
Or consider if you really need encryption at all. Since you need the USB key to boot, most users leave it in the unit or near by, pretty much defeating the usefulness of encryption if the unit is stolen since the thief will also get the key. If you are encrypting so data on a removed drive isn't recoverable, you can simply plan to erase the drive. If the drive has failed and can't be erased, consider whether you have any data on it that's so prized that somebody would go through the effort of trying and recover it from a single non-working drive from a RAID.
And one more thing: There is no recovery software available to recover an encrypted ReadyNAS volume. If your NAS dies, the only recovery is by buying a replacement or, perhaps, using a ReadyNAS virtual machine (I've done recovery on a VM, but never used encryption on the VM for anything).
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