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My RN20400 is running OS 6.6.0, drives are in X-RAID mode
It used to have 4 drives in this configuration:
2TB | 4TB | 4TB | 4TB
I needed to upgrade the space, so I removed the 2TB disk, and replaced it with a 6TB disk (Seagate ST6000VN0021 IronWolf NAS). When it got done with the resync, it was still reporting 9.08TB total capacity. I was expecting something closer to 10.8TB. Is there something else that I need to do?
So I tried replacing the disk, and no dice. It resynced the array, but didn't expand it. I finally just decided to do a backup of the config, did a factory reset, and restored the config and put my data back on. 10.9 TB total space now.
Yeah, I did. I thought I read somewhere here that a reboot was needed, but I can't remember where exactly (I need to bookmark more!).
Usually a reboot is only needed the first time a new RAID layer is added. But that doesn't really apply to your case, the second RAID-layer was already in use on the three 4 TB drives.
But still, a couple of reboot tries might kick-start it.
Another thing you could try is removing the drive and adding it again. The NAS should detect it as "used" so you'd need to format it in order to add it to the volume.
So I tried replacing the disk, and no dice. It resynced the array, but didn't expand it. I finally just decided to do a backup of the config, did a factory reset, and restored the config and put my data back on. 10.9 TB total space now.
