Reconstructing a RAID 1 array on a PERC3/DCL

[Gene Hastings]

We have a system with a RAID 1 configuration with 1 drive showing 
errors. Taking the system offline to do an array consistency check is 
unattractive to users and management. The documentation seems to say 
that I could plug a 3rd drive in as a hot spare, and have the array 
reconstruct itself on a running system.

Is this correct?

How do I tell when it's done?

The affected server is a PowerEdge 1550, and my predecessors did not 
see fit to install any Dell utiliites, much less a utility partition, 
so my only tools are those in the BIOS.

Thanks,
Gene Hastings
iCarnegie, Inc.