iometer If dynamo and iometer hangs

*** If dynamo and iometer hangs here, please make sure
*** you use a correct -m <manager_computer_name> that
*** can ping from iometer machine. use IP if need.
   Login accepted.
Reporting drive information...
Set_Sizes: Open on "/sys/iobw.tst" failed (error Permission denied).
Set_Sizes: Open on "/sys/fs/cgroup/iobw.tst" failed (error Invalid argument).
Set_Sizes: Open on "/sys/fs/fuse/connections/iobw.tst" failed (error Permission                                                                                              denied).
Set_Sizes: Open on "/sys/kernel/debug/iobw.tst" failed (error Permission denied)                                                                                             .
Set_Sizes: Open on "/sys/kernel/security/iobw.tst" failed (error Permission deni


這問題就是圖形介面的iometer要先關閉,不然會有這問題