That's the ticket. I wonder if anyone has tried building a "rescue USB thumb drive" since the 1GB devices are so cheap these days. That would be great for this kind of situation. Cheers, Peter Farrow wrote: > you probably have to boot from the cd using rescue mode as well: > > at the cd boot prompt: > > linux rescue > > this will release the "busy" devices as you can unmount them as you go... > > P. > > > > Nigel kendrick wrote: > >> I have a CentOS 4.2 system that was set up VERY quickly following the >> demise >> of its former life as a CentOS 3 server - you don't want the full >> story, but >> it had to be done quickly to get a company up and working following a >> slight >> disaster involving an electrician, a portable appliance safety tester >> and a >> pulled power cable - anyway, here's where I am at... >> >> Everything is running fine but I now want to mirror the root partition >> (/dev/hda3). I have read quite a few set of notes on the theory but >> since >> they contain conflicting advice I am hoping someone here can set me >> straight >> - here's what IO want to do: >> >> hda3 and hde3 become a mirrored pair (/dev/md0) and this is mounted >> at boot >> time as / >> >> Is it as simple as a quick mdadm command and then an edit of >> /etc/inittab?? >> >> If I try and use mdadm right now I get complaints that /dev/hda3 is busy >> (fair enough) so I guess I need to be in less than 'full steam ahead' >> mode >> to make the change - over to you.... >>