CFS(Cluster File System) issue

Hi,everyone.

I encounterd a problem that some directories could not be accessed,for example:

the file system "/home/netnumen",which using CFS,can not use the command "ls" to show the file(directory) it has,just hung up;

but when I entered  "/home/netnumen/ems",and then executed "ls" again ,it worked,and other directories can be accessed too;

I tried to offline the resource,it failed too,but when i rebooted the host,the problem just dispeared,i don't known why ,please help me.

thank you~

PS:

df -k

/dev/vx/dsk/ixtnms12_nmsdg/ixtnms12_emsuep
                      31457280    754476  28784012   3% /home/emsuep
/dev/vx/dsk/ixtnms12_nmsdg/ixtnms12_emsoracle
                      25600000  16269756   8747236  66% /home/emsoracle
/dev/vx/dsk/ixtnms12_nmsdg/ixtnms12_iManagerVersion
                       5242880    234603   4696087   5% /home/iManagerVersion
/dev/vx/dsk/ixtnms12_nmsdg/ixtnms12_emszsmart
                      31457280   6533827  23365744  22% /home/emszsmart
/dev/vx/dsk/ixtnms12_nmsdg/ixtnms12_imdb
                      20971520  11671713   8718576  58% /home/imdb
/dev/vx/dsk/ixtnms12_nmsdg/ixtnms12_netnumen
                      15728640   1690225  13167495  12% /home/netnumen

CFSMount_A.log

2011/09/20 13:16:24 VCS ERROR V-16-2-13068 Thread(4137659248) Resource(cfsmount6) - clean completed successfully.
2011/09/20 13:16:24 VCS ERROR V-16-2-13077 Thread(4133481328) Agent is unable to offline resource(cfsmount6). Administrative intervention may be required.