[OpenIndiana-discuss] Replacing a faulty rpool disk

[EM - SC]

Hello

I have a failing disk in my rpool.
This pool has only one disc (oops).. and I would like to replace it,
hopefully without data loss.

The server has a spare disk, but I never thought about making rpool mirror.

Can I mirror this rpool now, and then replace the faulty disk (hoping
that resilvering finishes OK)?
Or do I need to mirror the rpool and reboot the server before removing
the faulty one?

Thanks!
e