Tip de jour: if you want disk space info for an XC server use this handy shell command and parse the result (thank you google):
python -c ‘import os; print os.statvfs("/")’
result is something like:
posix.statvfs_result(f_bsize=4096, f_frsize=4096, f_blocks=5160351, f_bfree=1187750, f_bavail=925619, f_files=1310720, f_ffree=1262709, f_favail=1262709, f_flag=1024, f_namemax=255)