My spec
N54L boot loader 1.01 DSM6.0.2
3 x 3TB and 99% full
When I try to add 1 more 3TB disk and add disk, I got error system failed to expand.
I then googled and tried to telnet and fsck.ext4 but still no luck.
I then tried to pull out 1 disk and system degraded, added the new disk for repair but I got error "System failed to repair [Volume 2] with disk [3]."
I think backup and rebuild the whole volume is the only option?