Meeting Network Requirements

This topic describes the network requirements and considerations of A-Links, business networks, private networks, the quorum server connections, and the management network for a successful SplitSite configuration .(For general information about these networks, see Network Architecture.)

A-Link network connections must meet the following requirements:

• The A-Links use IPv6 addressing.
• A-Links can be dedicated point-to-point fiber connections. If they are not, they must be configured on a VLAN, where each A-Link is connected on its own VLAN.
• FT VMs require less than 2ms RTT A-Link latency.
• HA VMs require less than 10ms RTT A-Link latency.
• Each A-Link must have enough bandwidth to meet the needs of all VMs on the system. Whenever possible, provide, per A-Link, at least one NIC of at least 1Gb and full duplex; use 10 Gb if possible.
• When planning your network infrastructure, you need to account for the uplink bandwidth between the switch and the network backbone across all the ports in use on that switch.
• Do not use a common card (multiport NIC) for both A-Links.

• If these requirements are not met, guest VMs may run more slowly due to limited synchronization bandwidth between the two nodes.

The first business network (ibiz0) is used for communication between the nodes and to the quorum server. The ibiz0 network must meet the following requirements:

• The two nodes must be on the same subnet.
• The network must allow IPv6 multicast traffic between the two nodes.

• The two nodes can access the quorum server using IPv4 network addressing.

Private network connections (priv0 through privn) must meet the following requirements:

• NICs must be at least 1 Gb and full-duplex; use 10 Gb, if possible.
• A minimum bandwidth of 155 Mbps per VM.
• A maximum inter-site latency of 10 ms, round-trip time. Switches and/or fiber-to-copper converters connected to the private network must be non-routed and non-blocking, with a round-trip latency that does not exceed 10 ms. Calculate latency at 1 ms for each 100 miles of fiber, plus any latency added by non-routed, non-blocking switches or fiber converters.

• The private network can be a dedicated point-to-point fiber connection. If it is not, it must be configured on a private VLAN. VLANs used to connect the private-network ports must not add any filtering on any of the network equipment between the two VLAN switch ports that are connected to the everRun PMs.

Network connections for the quorum server must meet the following requirements:

• Access to the quorum service must be provided using ibiz0, using IPv4 network addressing.

• Two UDP ports must be open and available for communication between the nodes and the quorum service, including in the firewalls. By default, these ports are 4557 and 4558. If you want to change these ports, see Configuring the Quorum Service Port (on the quorum computer) and Configuring the Quorum Server Within the everRun Availability Console.
  

• Latency between an everRun node and the quorum computer should be less than 500ms RTT.

• Throughput is not an important consideration. 10Mb Ethernet, or even T1 bandwidth is adequate.

• Quorum computers are common to all VMs on the same everRun system.

• Quorum computers may be shared among many everRun systems.

• Quorum computers must never be implemented as a VM on the same everRun system that uses it.

• Use different network infrastructure, don’t share. An everRun node should not depend on a gateway or switch/router on the partner node site for sustained access to a quorum services computer.

Management network connections must meet the following requirements:

• By default, the management network is shared with a business network. In this case, all requirements for a business network apply.

• Configure gateways to a business LAN for remote management.

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