Meeting Network Requirements

This topic describes the network requirements and considerations of A-Links, business networks, the quorum server connections, and the management network for a successful ALSR 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.
• Each A-Link must be connected on its own VLAN. A-Link traffic is not routable.
  • FT VMs require less than 2ms RTT A-Link latency (only available on 110i systems).​

  • HA VMs require less than 10ms RTT A-Link latency (available on all ztC Edge systems).

  • You need to provide enough bandwidth to meet the needs of all VMs on the system, and you need to provide a speed of at least 1Gb per A-Link.

  • 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.

  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.

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 ztC Console.
  

• Latency between a ztC Edge 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 ztC Edge system.

• Quorum computers may be shared among many ztC Edge systems.

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

• Use different network infrastructure, don’t share. A ztC Edge 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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Product Documentation (PDF Format) ztC Edge User's Guide ztC Edge 100i/110i Systems: Deploying a Dual-Node System (R012Z) ztC Edge 100i/110i Systems: Replacing a Node (R013Z) ztC Edge 100i/110i Systems: Deploying a Single-Node System (R014Z) ztC Edge 100i/110i Systems: Adding a Node (R015Z)	About Help Help created at 10:27 PM on 4/29/2021.