Hi,
-Migrate root and IOfencing device:
On any node we shutdown the VCS:hastop -all.Also unload IOfencing device.The purpose of this is to avoid any timeout IOfencing,if we have vcs and IOfencing up,during the IOfencing device mirroring.This timeout could lead to service failover or node crash.
Now the vcs is down but at the file system level and vxvm level we still have glm and master/slave architecture,so the processes from different nodes will not corrupt the data.
Once you run hastop -all you will bring down all had process, this will include ports h, f,v and w. That basically means that CVM will be down and you'll have no CFS file systems mounted that are part of service groups.
You can then stop the remaining ports, o,d,b, and a. After that I would just run the process to reconfigure fencing using your new disks.
https://sort.symantec.com/public/documents/sf/5.0/linux/html/sf_rac_install/sfrac_install23.html#1159142