Hi again everyone.
I'm gonna post the solution I found in case it would be usefull to someone else.
First of all, the problem that caused my post was due to some bad sectors.
After a reseirfsck --check the message was: run reiserfsck with the "rebuild tree" option.
As you may know the rebuil tree option is not a good idea if you don't have your data backed up and I didn't.
So after some experiments I tried to dd everything. AFter 36 hours and I was obliged to kill it by Ctrl-C cause the server should be up again....(monday morning..)
As you can imagine the duplicated disk was not good at all.
Then another idea came into my mind. I knew I had a spare partition in my server.
So why not migrate by hand everything that is not yet affected to the good partition (and create exactly the same file tree, same permissions etc) and then mount it where the affected partition was?
Well in my case this worked great (remember that my main broken folder was my spam folder....)
After that I formated the broken partition and oops a new disk ready to use.
Now I have cloned the disk and from now on I 'll be less stressed in a situation like this!
THANX (ONCE MORE) FOR YOUR REPLIES!!