re-adding a replacement into a pool of mirrors

[Randy Bush]

> "geom <class> list" might show you something... Try the part and label 
> classes.

new unused drive is da12

# geom part list
# geom label list
Geom name: da1s1
Providers:
1. Name: ufsid/4a16c4ae7a243ed1
   Mediasize: 17174352384 (16G)
   Sectorsize: 512
   Mode: r0w0e0
   secoffset: 0
   offset: 0
   seclength: 33543657
   length: 17174352384
   index: 0
Consumers:
1. Name: da1s1
   Mediasize: 17174352384 (16G)
   Sectorsize: 512
   Mode: r0w0e0

> You're using a partition for the vdev rather than the entire disk. What 
> partition type did you use for creating it?

165

randy