I am new to galaxy and just going over the tutorial. I followed the instruction and try to get data from UCSC chr22. Once I clicked "send query to Galaxy", it says "You are over your disk quota.Tool execution is on hold until your disk usage drops below your allocated quota." How could this be? I have not used Galaxy before and I have zero data.
Account quota is different on different servers. For public servers, the quota could be noted on this wiki, by contacting the owners of the site, or on the home page of the Galaxy site itself: https://wiki.galaxyproject.org/BigPicture/Choices
At the Galaxy Main server at http://usegalaxy.org, this is 250 GB (your usage is ~9 GB).
At the Galaxy Test server at https://test.galaxyproject.org, this is 10 GB (no account).
When following the Galaxy 101, be sure to use the updated version (all of chr22 is not used, but a region of a chromosome - smaller datasets help the jobs execute quicker): http://usegalaxy.org/galaxy101
More help can be found here: https://wiki.galaxyproject.org/Support
Thanks, Jen, Galaxy team