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Attribute unique in XML metadata (-o metadata) is set to TRUE (1) by default in all of the cases. "Unique" should be used only in situation where same value cannot be used across several agents. Fence agents do not have such kind of attributes so default value should be FALSE (0).

Fixed in upstream:

http://git.fedorahosted.org/git/?p=fence-agents.git;a=commit;h=aefb817f08bfa8f2f1b1c1270ad4d697649fa40c

I looked through the metadata generated by all fence agents and found the following agents still produce unique parameters

fence_brocade
fence_drac
fence_egenera
fence_kdump
fence_scsi

Should these fence agents be fixed too?

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2012-0943.html