Replace Disk fails from GUI in 8.0.3-p1 due to inconsistent swap partition size
Replace disk from GUI fails without explanation when using identical 2TB disk.
After doing replace disk from GUI, there is no apparent resilvering activity taking place or message in the GUI about the failure. After trying replace command from the command line, I got the error "disk is too small". When doing a gpart show, I discovered the problem was that 8.0.3-p1 created a 2GB swap partition as opposed to the 1GB swap partition that was created when I initially created my pool from the GUI in version 8.0. So it seems that the GUI needs to check existing swap partition size and makes sure it creates the new one consistent with the size on the other disks. I manually wiped the disk and recreated the partitions and did the replace from the command line using the same command that was issued from the GUI in the log file.
Here is the forum thread with log files etc.