Synology High Availability

High Availability refers to a server layout solution designed to reduce interruptions of services caused by server malfunctions. High Availability uses multiple servers to form a "high-availability cluster" in which one server assumes the role of "active server" and another server acts as a standby "passive server." In order to implement and create a high-availability cluster, you need two compatible Synology servers.

A high-availability cluster makes use of the following components and concepts:

High Availability Features

Limitation

This section describes the limitation and requirements of high-availability cluster. Make sure to read this section before you start using Synology High Availability.

Synology High Availability Wizard

This wizard helps create and configure a high-availability cluster.

Overview

Displays basic information about the high-availability cluster and member servers. This section also provides tools to create and manage the high-availability cluster

Network Settings

View information and edit settings related to the high-availability cluster's IP address; Change the name or IP address of the high-availability cluster's server.

Service Monitor

View services which can be monitored; Indicate whether services should be transferred from the active server to the passive server, and the two servers roles exchanged, if monitored services malfunction.

Storage Status

Displays the status of all usable volumes and iSCSI LUNs (Block-Level) on the high-availability cluster. When a volume or iSCSI LUN crashes or becomes degraded, you can repair it from this page.

Disk Status

View the statuses of the disks in the active and passive servers. If you wish to replace disks, please use this page to ascertain the corresponding disk numbers in the active and passive servers. It is strongly advised that disks of identical storage volume be used for the same disk number on both the active and passive servers.

Switchover

This section provides an explanation of performing a switchover of services from the active server to the passive server.

Shut down and Reset

This section guides you through the process of shutting down, removing, or resetting a high-availability cluster.

Split-brain

This section guides you through the process of fixing a split-brain error.