/ partition full .. need quick solution

Hello,

I have an immediate issue that I would welcome suggestions as to the 
most appropriate manner of dealing with this problem.

I have a server running RH 9. I acts as my main mail server, a secondary 
DNS server and a secondary web server for developing projects. We never 
had, or had the need to until now, imposed quotas on our users 
mailboxes. We took on a large client for a web development project and 
ended up with 350 plus mail users, all of whom tend to leave mail on the 
server. From what I understand, there is no easy way to get quotas 
running without disrupting service to my users. Am I wrong? Anyway, the 
bigger more immediate issue is that my / partition is now full and I am 
looking for suggestions on how to deal with this. Is there a way to add 
a new drive into the mix and soft link the users home directories over 
to it? When this machine was first set up, it was set up with a / 
partition that was much too small and ultimately I will replace this 
machine with a different one that is more appropriately set up.

Here is my current situation:

Filesystem            Size  Used Avail Use% Mounted on
/dev/hda2             572M  572M     0 100% /
/dev/hda1             122M   29M   87M  25% /boot
/dev/hda3             5.4G  2.1G  3.1G  41% /home
none                  496M     0  496M   0% /dev/shm
/dev/hda7              28G   15G   12G  56% /usr
/dev/hda5             2.0G  1.4G  436M  77% /var

Any help or suggestions are greatly appreciated.

Dave
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