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Added a new 4TB HDD to NAS. It is the same size and make of the previous one. The NAS synced for several hours and the HDD now shows up in the NAS. However I am unable to format or add new volume. I swithced to FlexRAID and it is not working
If X-RAID was enabled when you added the disk it would have been automatically used to provide redundancy. That's what the several hours of syncing was doing.
You can backup your data, disable X-RAID (if it's currently enabled), destroy the volume (note this wipes all data) and then create the new ones you want and then restore your data from backup.
Alternatively you could add another disk and this time you would get expansion using X-RAID.
If X-RAID was enabled when you added the disk it would have been automatically used to provide redundancy. That's what the several hours of syncing was doing.
You can backup your data, disable X-RAID (if it's currently enabled), destroy the volume (note this wipes all data) and then create the new ones you want and then restore your data from backup.
Alternatively you could add another disk and this time you would get expansion using X-RAID.
I cannot backup data; was using NAS as backup. Is there someway of doing this without destroying the two disks
If the NAS is primary storage, then you do need a backup. RAID alone is not enough to keep your data safe. If it is backing up other devices, then it might not need a backup (depending on your overall backup strategy).
At this point the only non-destructive path is to add another 4 TB disk to the array (which will give you an 8 TB volume).
If you do destroy the volume and switch to flexraid, then I recommend creating two volumes (one for each disk). A single volume is fragile - when either disk fails, then you lose all the data on both disks. With two volumes, a disk failure only loses the data on the failed disk.
