If you get jeopardy, you could add a lowpri link to llttab which would require stopping and starting llt - there is no need to unload kernel module, just stop using lltconifg -U and start using lltconfig -c (as gab depends on llt and VCS depends on gab, you will need to restart gab and VCS also and you can use "hastart -all -force" to stop VCS so apps remain running).
However, it is better to setup low-pri link before you have an issue, which will only be used for infrequent heartbeats when both private heartbeats are working and will be promoted to full heartbeat if it is the only heartbeat left.
Fencing is recommended by Symantec, but not compulsory and in practice most customers only use fencing where it is mandatory for SFCFS, because although fencing is good in theory, it can bring down nodes when you don't want it to because of admin error, bugs, or just certain side case scenarios.
Mike
