Hi Tex and thanks for taking the time to answer.
I’m running a fresh install of Rockstor 4.5.8-0. The relevant drives are 2 brand new units plus 2 hdds rescued from older PCs, wiped and formatted. So no previous pools or shares. Rebooting didn’t help either.
I’m thinking its to do with the
["ERROR: superblock magic doesn't match", 'ERROR: not enough free space to allocate chunk', '']
but I’m afraid I don’t know what to do about that.
PS: Another user with the same issue said they solved it using Rockstor’s built-in wipe. I tried that, but nothing changed.