07-02-2012
Just spun up a CentOS box to check, and you're right, the box does boot, you just can't do much with it as it does not have anything mounted filesystem-wise.
The good news is that you could recreate the /etc/fstab file manually and as long as it matched the original, with everything mounted in the correct place, you could carry on using your server as if nothing had happened, after a reboot of course.
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