We have a Sun X4500 ‘Thumper’ that recently had a failed drive. Our zpools are all raidz2 with 4 spares. We were getting errors on the disk c1t5d0, although the drive hadn’t failed completely.
As we had not yet tested replacing a ‘live’ drive the disk was pulled from the system before running any commands to remove it from the pool.
You can run the following command to see the status of your pools –