The VSA cluster network requires a number of static IP addresses. Depending on the number of hosts in the cluster and whether you choose to use DHCP for the vSphere feature network, the number of required static IP addresses varies.

vCenter Server and VSA Manager do not need to be in the same subnet as VSA clusters. Members of each VSA cluster, including the VSA cluster service for a 2-member configuration, need to be in the same subnet.

The following table shows examples and the total number of static IP address that you need for various VSA cluster configurations.

Note: For a 2-member VSA cluster with a simple configuration, you do not need an extra static IP for the VSA cluster service. You can use the IP address of vCenter Server as the IP for the VSA cluster service.
Table 1. Examples of Static IP Addresses for Different VSA Cluster Configurations
VSA Cluster Component 2-Member Cluster Without DHCP 2-Member Cluster With DHCP 3-Member Cluster Without DHCP 3-Member Cluster With DHCP
Number of static IP addresses in the same subnet 11 9 14 11
Number of IP addresses in a private subnet for the back-end network 2 2 3 3
vCenter Server IP address 10.15.20.100 10.15.20.100 10.15.20.100 10.15.20.100
ESXi host 1 IP address 10.15.20.101 10.15.20.101 10.15.20.101 10.15.20.101
ESXi host 2 IP address 10.15.20.102 10.15.20.102 10.15.20.102 10.15.20.102
ESXi host 3 IP address N/A N/A 10.15.20.103 10.15.20.103
VSA cluster IP address 10.15.20.103 10.15.20.103 10.15.20.104 10.15.20.104
VSA cluster service IP address 10.15.20.104 10.15.20.104 N/A N/A
Management IP address for VSA 1 10.15.20.105 10.15.20.105 10.15.20.105 10.15.20.105
Datastore IP address for VSA 1 10.15.20.106 10.15.20.106 10.15.20.106 10.15.20.106
Back-end IP address for VSA 1 192.168.0.1 192.168.0.1 192.168.0.1 192.168.0.1
vSphere feature IP address for ESXi host 1 10.15.20.107 10.15.20.201, dynamically assigned IP address
Note: DHCP assigns an IP address according to the range of IP addresses assigned to the DHCP server.
10.15.20.107 10.15.20.201, dynamically assigned IP address
Note: DHCP assigns an IP address according to the range of IP addresses assigned to the DHCP server.
Management IP address for VSA 2 10.15.20.108 10.15.20.107 10.15.20.108 10.15.20.107
Datastore IP address for VSA 2 10.15.20.109 10.15.20.108 10.15.20.109 10.15.20.108
Back-end IP address for VSA 2 192.168.0.2 192.168.0.2 192.168.0.2 192.168.0.2
vSphere feature IP address for ESXi host 2 10.15.20.110 10.15.20.202, dynamically assigned IP address
Note: DHCP assigns an IP address according to the range of IP addresses assigned to the DHCP server.
10.15.20.110 10.15.20.202, dynamically assigned IP address
Note: DHCP assigns an IP address according to the range of IP addresses assigned to the DHCP server.
Management IP address for VSA 3 N/A N/A 10.15.20.111 10.15.20.109
Datastore IP address for VSA 3 N/A N/A 10.15.20.112 10.15.20.110
Back-end IP address for VSA 3 N/A N/A 192.168.0.3 192.168.0.3
vSphere feature IP address for ESXi host 3 N/A N/A 10.15.20.113 10.15.20.203, dynamically assigned IP address
Note: DHCP assigns an IP address according to the range of IP addresses assigned to the DHCP server.