How to upgrade SAP Kernel in clustered environment

I have a SAP R3 4.6 C installed on cluster environment, such that if one server goes down, the second clustered server takes the charge of all the resources from failing server. Also I have 6 application servers.
This is the reason, I have to mantain the SAP exe files in /exe/run on the 6 different application servers seperately. My question is: If I have a shared directory for exe files on central instance, and it goes down, then the 6 application servers will lose connection to those exe files. Then, how should I then connect these 6 apps servers to exe files of the 2nd failover clustered server?
So please let me know how to resolve this problem.

Hi Matt,
Thanks for the update. The cluster is installed with virtual host. But unfortunately we have all exe files seperately on different 6 app servers. Should we NFS mount the exe directory on all apps server. Is NFS mounting sufficient or there are any additional steps to done. I heard that we have to activate sapcpe on the apps server.
Also after the kernel upgrade, do we have to distribute it on all the apps servers. Can you kindly guide me in this issue.
Thanks,
Arun

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