OK, so I had the following setup:
- 4 4TB Hard drives
- Single Virtual Disk set as "Fixed" to the maximum size and 2-Way mirror
Seeing that I was approaching a point where the disk would fill up, I acquired 2 more 4TB drives. My initial naive thought was to add those additional hard drives to the pool, then go ahead and expand the virtual disk?
Not so lucky. When trying to expand the disk, it did not show any available space for expansion.
Great. OK. Well, I might as well remove those new disks from the pool so I can use them another way?
Not so lucky. Now the Storage Spaces tells me that I cannot remove a disk from the pool without adding another disk as large in size. I've also tried to manually mark the disks as "Retired", but that just ended up putting the virtual disk into degraded status and in such a way as repairing them did not seem to work.
So I added the new drives back into the pool, and was able to get back to a non-degraded status.
So as it stands, those 2 new disks are doing nothing but sitting there, unused, as part of a pool where the virtual disk cannot be expanded to use them.
Help!