Adding software RAID to installed system

[Fabian Peters]

Hi folks,

Has anybody successfully created a RAID1 without erasing the existing  
boot disk (possibly even w/o rebooting?) on OS X Server 10.4? Apple's  
"Getting Started" guide states it's ok:

"If the target disk has a single partition and the second physical  
drive has a single partition and no data, you can set up RAID  
mirroring after installation."

Which I figure is what I'd like to do but I feel the wording is a bit  
vague. Of course in any case the usual caveats to back up beforehand  
do apply...

Thanks for your insights

Fabian