We previously wrote about some RAID rebuilding issues we were having and that the way around it was to reboot your computer into the OS X Installer disks, open up Terminal and enter in a string of commands.

Fortunately Apple has fixed an issue within the Disk Utility application that allows it to work as intended. Now you can simply drag new disks into a RAID set and click on the Rebuild button and it’ll work properly!

I just tried it out this weekend and it successfully rebuilt a degraded mirror RAID set!