Modifying fstab file on T7400

[Marco.Monopoli at apbrakes.it]

I have created a raid disk and now I need to modify the fstab file on 
RHWS5 x64 on a precision T7400.
Dell support has problems to help me because they aren?t too skilled on 
Linux, even if I have bought 3 years of business support. 
Now the system stops during the start-up because it's impossible mount the 
old disk configuration.
Entering as root in repair file system I cannot modify the file, all the 
files and directory are read-only.
How can I modify and save the read-only file?

Thanks

Marco
 
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