Disk Util Repair Permissions on Mac OS X Lion RAID 0
So it turns out that if you have a Mac OS X Lion on RAID 0 that you can’t run Verify/Repair Permissions on your hard drive, at least via Disk Utility. You can however still run from the command line, just enter:
sudo diskutil repairPermissions /
If you want to repair the disk you will have to do so from Single User mode – hold down the Apple ⌘ + S while the system is booting up, then run:
/sbin/fsck -fy sudo fsck_hfs -f /dev/disk4s2