Synology High Availability (SHA)


damages are caused
by theaverage
service disruption


of small businesses never
reopen after catastrophic
data loss


of small and medium-sized
businesses remain
unprepared for disaster

How does Synology High Availability 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.

Best-in-class availability

SHA runs on a wide range of Synology NAS, so your business can find the best option for your environment and budget. Already chosen by banks, hospitals, universities and governments, SHA does not compromise between cost and reliability.


For virtualization

Increase the availability of virtual machines stored on Synology NAS and accessed through iSCSI or NFS.

For highly available services

Minimize downtime caused by software updates, hardware upgrades, and system failures on Synology packages and built-in services.

Simple management

Rely on Synology High Availability’s unified interface to set up, manage, and monitor your high-availability clusters with ease.

Quorum server

Help preventing split-brain situations by connecting a quorum node to ensure data consistency.

Synology High Availability (HA) in action


Boutique video production agency MLC TV adopted SHA to keep data loss at bay. As a result, the agency is able to achieve

  • Real-time protection ensures that footage is always available
  • Near-zero downtime means reduced maintenance costs

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Belgian Emergency Zone NAGE implemented SHA to protect its dispatching software. Consequently, NAGE is able to obtain

  • Minute-level failover ensures that communication is never disrupted
  • Maximum uptime means rapid intervention when lives are at stake

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