Disk Utility may not be able to verify or repair permissions on a software RAID set
Symptoms
When Lion is installed on a software RAID set, Disk Utility may not be able to verify or repair volume permissions. The process appears to start but immediately stops.
Resolution
Use the command line tool diskutil to verify and/or repair permissions on a software RAID volume. Note: The user running these commands must have administrative privileges.
https://support.apple.com/kb/TS4284
How does a bug like this survive testing?
Mac Pro, Windows 8 Preview x64 3.2GHz