OOF
I'm in a not dissimilar situation but different reasons. I made a mistake picking RAID5 in my array and when I added drives I got larger drives but can't use the additional space. I'm out of slots and using the majority of the space. To fix it I'm probably going to have to wait until I build my next NAS unless I want to send 90TB of data up to S3 and pay egress to get it back afterwards.