SAN vs BigIP vs NAS

Any thoughts on how to go here?

What would be the benefit of using a standalone hardware load balancer like BigIP vs getting a system that seemingly handles it all like a SAN?

Perhaps I need both? or a combination of something like BigIP + NAS + App servers.

Scenario:

1 Master domain that authenticates users, and redirects them to the appropriate application domain.
1 Master database
1 Slave database (failover already installed)
9 application servers
1.5 TB storage

I am at my wits end and looking for some input on the best way to convert 13 cpanel servers to a HA solution, with or without cPanel installed.When an app server goes down we find ourselves in hot water very quickly.

 

 

 

 

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