Tommaso Boccali wrote:
> Ciao, 
> the rot filesystem of my thumper is a ZFS with a single disk:
>
> bash-3.2# zpool status rpool
>   pool: rpool
>  state: ONLINE
>  scrub: none requested
> config:
>
>         NAME        STATE     READ WRITE CKSUM
>         rpool       ONLINE       0     0     0
>           c5t0d0s0  ONLINE       0     0     0
>         spares
>           c0t7d0    AVAIL   
>           c1t6d0    AVAIL   
>           c1t7d0    AVAIL   
>
>
> is it possible to add a mirror to it? I seem to be able only to add a 
> new PAIR of disks in mirror, but not to add a mirror to the existing 
> disk ...
>

As Edna and Robert mentioned, zpool attach will add the mirror.
But note that the X4500 has only two possible boot devices:
c5t0d0 and c5t4d0.  This is a BIOS limitation.  So you will want
to mirror with c5t4d0 and configure the disks for boot.  See the
docs on ZFS boot for details on how to configure the boot sectors
and grub.
 -- richard

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