Synology High Availability

Unexpected service disruptions can cost your company big as well as cause logistical headaches for your IT department. Synology High Availability (SHA) alleviates these issues and delivers a hassle-free method to mirror data and maximize your service uptime. SHA is available on select Synology NAS.

damages are caused by the average service disruption
of small businesses never reopen after catastrophic data loss
of small and medium-sized businesses remain unprepared for disaster

How does it work?

SHA combines two Synology NAS servers into one high-availability cluster (or HA cluster). One server assumes the role of active server, while the other becomes a standby passive server. The active server handles all data requests and services, while everything is continuously replicated to the passive server. This provides a complete hardware and data redundancy solution in case of unforeseen accidents. Watch the video to learn more about SHA. See more videos from Synology

Real-time protection

With the real-time data mirroring mechanisms, all the data that is successfully written to the hard disks of the active server is replicated to the passive server in real time. This data synchronization ensures that in the event of hardware failure, all replicated data can be accessible soon after.

Automatic failover

The two servers communicate via a Heartbeat connection. When the active server becomes unavailable, the passive server automatically kicks in to ensure file services and applications can be recovered within minutes. The smooth transition maximizes service uptime to help businesses achieve service continuity.

  • Automatic failover
  • Automatic failover
  • Automatic failover

Robust HA solution

Synology High Availability makes the cluster robust and stable for resource-demanding services, such as storage for virtualization. With real-time data replication, the passive server can resume the majority of running services whenever needed.

Virtualization ready

Synology NAS is an ideal target for accessing virtual machines through iSCSI. SHA ensures stored virtual machines are constantly available. Certified for VMware, Citrix, and Windows Server, a Synology NAS also benefits from a user-friendly LUN manager for rapid creation, cloning, or removal. Learn more about virtualization support

Highly available application server

Intuitive application serving is an essential part of the Synology experience. Whether it's file services, web service, or Cloud Station, most Synology packages and built-in services are compatible with SHA to maximize uptime when hardware failure occurs. Learn more about other features

Additional features

The user-friendly design reduces the effort required for setting up a powerful HA cluster. The quorum server further enhances the stability when the passive server needs to take over the services.

Hassle-free installation and maintenance

Quorum server ready

The intuitive user interface makes SHA super simple to set up and get running. With its handy, built-in management tools, you can easily monitor the HA cluster and perform maintenance, without needing to acquire additional technical knowledge. Learn how to set up an SHA configuration

The timing for the passive server to take over the main operation is critical. Quorum Server plays the key role in reducing the occurrence of split-brain effectively, thus maximizing service continuity and data consistency.