High Availability:Hardware:Hosts

The hosts are another critical module of TelcoBridges solutions and hosts redundancy will greatly improve the high availability and reliability of your system.

Primary switchover

Let's see the consequences of losing the primary host. Here is the state of a redundancy host setup after an installation:

If the primary host is lost, two high availability mechanisms will be activated:

• standby Toolpack will become active
• slave database will become master.

This will allow the system to keep functioning without manual operation (note that transient calls will be lost during the switchover), as illustrated in the following picture.

When the primary host is recovered, the active Toolpack system and the master database will stay on the secondary host.

Secondary switchover

Let's see the consequences of losing the secondary host. Here is the state of a redundancy host setup after an installation:

If the secondary host is lost there are no effect on the system, since the active Toolpack system was already running the primary host.

When the secondary host is recovered, the system returns to its original state (just like after the installation).

NOTE: The database and host redundancy mechanism are two separate features, meaning that a database switchover will not necessarily cause a host switchover as well.

Recommended Setup

Recommended Hardware

• Use TelcoBridges servers TMG7800-CTRL,[FreeSBC|TSBC-HW-SRV]]
• Having dual power supplies is a plus
• The number of network interface needed by a system is application specific, but for TelcoBridges products at least two independent network interfaces are needed for controlling Tmedia and another one to connect to the management network.

Warnings

• IP Teaming/ IP Bonding - TelcoBridges Hardware doesn't support IP Teaming (Ip Bonding). TelcoBridges products can't work with the host configure with Ip Teaming in the system. TelcoBridges products uses 2 network interfaces to achieve the same goal.
• RAID - It is highly recommended to disable BIOS RAID on the motherboard. Use software RAID instead, also known as MD RAID.