User`s guide

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Chapter
18
Chapter 18: Provide Nonstop Service with Synology
High Availability
High Availability refers to a server layout solution designed to reduce interruptions of services caused by server
malfunctions. With Synology High Availability, two servers form a “high-availability cluster,” in which one assumes
the role of the active server while the other acts as the stand-by server. If the server malfunctions, the stand-by
server takes over all services, thus minimizing server downtime.
This chapter provides a brief overview of Synology High Availability’s features. For more detailed instructions,
please see DSM Help.
Understand Synology High Availability
Implementation of Synology High Availability requires two Synology NAS servers to create a high-availability
cluster. One server acts as "active server" and the other acts as "passive server." Once the high-availability
cluster is created, data is continuously replicated from the active server to the passive server. All files on the
active server will exist in duplicate on the passive server.
Active Server
The active server manages the provision of all services. If errors occur on the active server, you or the system
can initiate a switchover to the passive server. In this case, the provision of services is transferred to the passive
server, at which point the active server becomes the passive server.