# metareplace -e d20 c2t0d0s2 |
The RAID5 metadevice d20 has a slice, c2t0d0s2, which had a soft error. The metareplace command with the -e option enables the slice.
If a disk drive is defective, you can either replace it with another available disk (and its slices) on the system as documented in "How to Replace a RAID5 Slice (Command Line)", or repair/replace the disk, format it, and run metareplace with the -e option.