A quick tip on finding and deleting big files on your cluster account. Use mmlsquota to inspect your quota usage on GPFS filesystems. This will tell you whether you really need to clean up. Use du -hs * to figure out how big your subdirectories are, and ls -lh to inspect the files in a directory. Use (with great caution) rm -rf <directory> to remove a big directory, and rm <filename> to delete a file (both commands are irreversible).