How do I find out what my quota is and how much I have used?

To find information concerning your quota, type
getquota.

You should see something resembling:

       user/group     ||           size          ||    chunk files    
      name     |  id  ||    used    |    hard    ||  used   |  hard   
 --------------|------||------------|------------||---------|---------
        jbsmith|  0001||   1.69 TiB |   3.00 TiB ||     8268| 31876689
          

The key information is contained in the middle two columns - this indicates a 3TB total quota, of which the user has so far used 1.69TB.