[Linux-cluster] GFS2 parameters

[Srija]

Hi,

I am using gfs2 in a cluster environment , 

OS  system using  RHEL5.5  86_64, 
kernel : 2.6.18-194.3.1.el5xen

Trying to tune the GFS file system,  but few parameters  not getting  , 

like demote_secs.  

The error is as follows:

gfs2_tool: can't open /sys/fs/gfs2/gfsred:GFS-XEN-IMAGES/tune/demote_secs: No such file or directory

Can anybody please help me , what I am missing?

thanks in advance