Setup Edublogs like hardware configuration

Want to setup server hardware like this:
But the article is a bit old from 2013. Is there any update configuration?

Will the following configuration enough to achieve that:
1) Barracuda WA(2) For load balancer

2) Nginx cluster of 2 physical machines (64 GB RAM, 16 core) for WP

3) MariaDB Replicated DB Cluster of 3 physical machines (slave replication) with HyperDB, HAProxy and a filestore on a SAN (128GB RAM, 64 Core x 3, 1.2TB per server)

Also, should we use Gluster FS for File storage? Or connect to a SAN with cards? Which is a better option for WP?