#in case of upgrade
#fix error in gfal-copy as show: 
gfal-copy
Traceback (most recent call last):
  File "/usr/bin/gfal-copy", line 8, in <module>
    from gfal2_util.shell import Gfal2Shell
  File "/usr/lib/python2.6/site-packages/gfal2_util/shell.py", line 7, in <module>
    from base import CommandBase
  File "/usr/lib/python2.6/site-packages/gfal2_util/base.py", line 15, in <module>
    import gfal2
ImportError: /usr/lib64/libgfal2.so.2: undefined symbol: g_list_free_full

means glib2 is < 2.28
"yum update glib2" should fix the promblem with gfal2