From gluster-users list:

not 'exportfs -f' but 'exportfs -r'. sorry.
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(2011/10/14 18:17), Tomoaki Sato wrote:
Krishna,

Thank you for your comments.
I've changed the script not to repeat gluster volume set command with same arguments.
Do you have any plans to make gluster restart-free like 'exportfs -f' of nfs.

tomo sato

(2011/10/14 18:03), Krishna Srinivas wrote:
Hi Tomo Sato,

Using gluster volume set command will restart the nfs server, hence
you should change the script so that it does not restart the nfs
server too often.

You can consult with the person who installed the script as it is not
a part of gluster installed scripts.

Krishna