The problem is that I cannot connect Dell with DMZ Switch because the latter is an HP with RJ45 and SFP ports (1gb max), while the Dell is 10gb SFP+ fixed.
Because of it, I would know if there was a software configuration or trick for having VMs that traffic each other on Dell (faster) and access to internet or to printer on HP Switch (slower).
If I was only one host is simple: VMs traffic is naturally faster because is inside virtual switch, while external is naturally on physical switch.
But with 3 hosts, I need to use Dell to have the same performance, because Office VMs are not only to a single host. That's why I 'd like to have VLAN 50 on both switch, but separated.
Good idea to create vDS for management, VLANs and NAS using 2 switch in HA (HP 1820-24G is capable?), but I don't know how to connect both to firewall (Sonicwall NSA3500).
Maybe using 2 Firewall (I have a spare part) in active/passive HA mode and connect one on first switch and one to second switch letting ESXi to decide the path that has Internet access?