[NTLUG:Discuss] File system problem, on a RH 7.3 machine

[Douglas King]

I have a server that needs to have a "check disk" run on the drive.  I have 
found out that it is the backup machine that craters the web server every 
night.  I forced a backup this morning on the a few of the directories, and 
it locked the system up.  I am using the scp backup method.  My question 
is....HOW do I run the following commands:

On the command line while the server is running, I enter:

e2fsck -b 8193 /dev/hda1

After I try this, I get:

WARNING!!!  Running e2fsck on a mounted filesystem may cause
SEVERE filesystem damage.

Do you really want to continue (y/n)? no

How do I need to do this safely, hopefully without loosing an data?