Hello,
First thing, Can I request elaborate the subject of forum thread ? for e.g, here you have kept thread name as "fencing" however you can mark it like "questions on registration keys in IOFencing". These forums are bit knowledge database & will be reused by others. If someone else is having similar question, he can simply read through existing thread rather than raising a new question again ... Also would appreciate if you can keep one quesiton per forum thread, will add much more clarity & simplicity for people looking for similar answers ..
To answer your query..
Every node will write registration keys on coodinator disks. You can check this with below command
# vxfenadm -s all -f /etc/vxfentab
membership register key .. I believe this is nothing but the registration keys. Registration keys are kept on coordinator disks & on data disks however there is another key called reservation keys which are kept only on data disks.
Last part, if the heartbeat fails, there will be race to win coordinator disks, the node which loses the race is paniced by vxfen driver
All this is very well documented & explained in admin guides, if you are new to VCS, do run through VCS guides, for IOFencing specific, read through below
https://sort.symantec.com/public/documents/sfha/6.1/solaris/productguides/html/vcs_admin/ch10.htm
G
