The Original Failover Solution

The mainstay of TZO-HA and the foundation of our high availability service is the unique capability of TZO-HA with Automatic DNS Failover. Entirely proprietary, (not Bind), TZO’s DNS was designed specifically for speed and resilience. This speed combined with extraordinarily low cache times allow for nearly instant automatic DNS failover or near real time traffic redirection for your mission critical environment. When TZO-HA monitors detect a failure they will send notifications and automatically update your DNS record or records so that the DNS requests are sent to the IP address of your alternate location, server or provider.

 

Unprecedented DNS Failover Time

The maximum time to re-direct DNS requests can be as low as 15 to 45 seconds. This includes failure detection, notification of failure, DNS record changes, and DNS propagation through-out all subordinate DNS servers on the public Internet around the World.

Multi-Point Monitoring

TZO-HA provides for multiple monitoring agents deployed in different geographic locations. This eliminates false positive notifications. Our default is a minimum of 2 monitoring points for any one IP or device that we are monitoring. Monitoring is quite flexible and can be done in a variety of methods. Standard port and protocol communication from simple ICMP ping, SMTP, POP3, Telnet, FTP, HTTP, HTTPS, text matching and SIP as well as script execution with expected return strings can be configured.

Multiple Failover modes

TZO-HA is very flexible and works with many varied implementations. Below are the most commonly used modes and examples of how they can help your business maintain the highest level of redundancy.

Failover Switch-Back will perform DNS failover to secondary in the event of an outage and automatically switch back DNS Failover to primary when the primary comes back on online.
Failover Stay-Over will automatically perform DNS failover to secondary and then stay on secondary even when the primary comes back on line.
‘Force’ option (or Manual mode) allows TZO-HA to operate manually where notifications of an outage are sent, then a decision can be made as to whether or not to manually perform DNS failover to secondary. The ‘Force’ options can also be used to manage traffic redirection for scheduled service maintenance.

 

Follower / Shadow records

Follower records are a very simple way to have multiple records failover simultaneously. In an example with dozens of web sites using virtual host headers pointing to one IP address, TZO-HA can set up one ‘Active’ domain for monitoring and all remaining records can be followers that will automatically switch to the secondary IP.

Shadow records work in a similar manner, except Shadow records have their own unique primary and secondary IPs. The same as with the follower domain, an active domain is defined as the failover record that will be defined with monitoring and failover. The shadow record will be defined with its own primary and secondary IP and will automatically failover to its secondary when the active domain detects an outage and fails over.

Browser Based Control

A secure web-based Control Panel allows for complete control over all TZO-HA service. The TZO control panel allows for complete DNS management of your entire DNS Zone information, including Host records, ‘A’ records, MX records, CNAMES, SPF strings and more.

AutoFailover Product Brochure (PDF)

Download the TZO-HA AutoFailover Product Brochure (PDF)

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