Netboot and the local hard drive?

I got a quick netboot option running on a test server (before enabling or messing with the production Xserve) and I've been able to boot several workstations and it's actually faster than I thought it might be. However, I was hoping I could use this for a couple of troubleshooting operations that I don't seem to be able to run.
For example, I would like to netboot a Mac and use the Disk Utility to "repair disk" on the local hard drive. The Disk Utility says that the operation failed because it could not unmount the volume.
When we image a Mac through the Terminal, all the invisible folders, files and links appear. We normally repair this after imaging, but a few Macs were overlooked. I was hoping that, instead of carrying around and booting off a FireWire hard drive to repair them, I would be able to quickly netboot and run the terminal command to re-hide the files. Unfortunately, this causes the same kernel panic that occurs when you do this on the the booted hard drive.
Perhaps I'm misunderstanding how netboot is supposed to work, but it appears that the local hard drive is still being used to the point where netbooting is really useless for these kinds of operations. Any advice or tips would be appreciated.
-Doug

There is a diskless option for netboot that works fine within a single subnet. It is not on by default and must be turned on from Server Admin -> NetBoot -> Images. You will also need AFP running on a sever in the subnet (preferably the same server).
See page 46 and 49 of this document for more details:
<http://images.apple.com/server/pdfs/SystemImage_and_SW_Updatev10.4C.pdf>
You also may want to look into Remote Desktop as a way of running scripts on multiple Macs en masse.
Diskless NetBooting works and works well. I use it at work with Remote Desktop to boot a remote Mac, run Disk Utility and Disk Warrior, then reboot. I have also used diskless netbooting for remote Panther to Tiger OS upgrades.
Diskless NetBoot is slick and has saved me gobs of time.
dual 2.0 GHz G5 (June 2004)   Mac OS X (10.4.6)   4 GB RAM 128 MB XT9600

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    http://support.apple.com/kb/HT4878
    Sounds like a permissions problem ie read only.
    If running repair permissions from your DiskUtility.app does not sort it,
    Someone should jump in here with erudite and concise fix.

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