Synology High Availability
Synology High Availability

Synology High Availability

Join Synology servers in a centrally managed failover cluster to maximize service uptime and boost the reliability of your business IT — for you and your customers.

Synology High Availability

Applied models

FS series: FS6400, FS3600, FS3410, FS3400, FS3017, FS2500, FS2017, FS1018
HD series: HD6500
SA series: SA6400, SA3610, SA3600, SA3410, SA3400D, SA3400, SA3200D
24 series: DS224+
23 series: RS2423RP+, RS2423+, DS1823xs+, DS923+, DS723+, DS423+
22 series: RS822RP+, RS822+, RS422+, DS3622xs+, DS2422+, DS1522+
21 series: RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+, DVA3221
20 series: RS820RP+, RS820+, DS1520+, DS920+, DS720+, DS620slim, DS420+, DS220+
19 series: RS1619xs+, RS1219+, DS2419+II, DS2419+, DS1819+, DS1019+
18 series: RS3618xs, RS2818RP+, RS2418RP+, RS2418+, RS818RP+, RS818+, DS3018xs, DS1618+, DS918+, DS718+
17 series: RS18017xs+, RS4017xs+, RS3617xs+, RS3617RPxs, RS3617xs, DS3617xsII, DS3617xs, DS1817+, DS1817, DS1517+, DS1517
16 series: RS18016xs+, RS2416RP+, RS2416+, DS916+, DS716+II, DS716+
15 series: RS815RP+, RS815+, DS3615xs, DS2415+, DS2015xs, DS1815+, DS1515+, DS1515, DS715, DS415+
14 series: RS3614xs+, RS3614RPxs, RS3614xs, RS2414RP+, RS2414+, RS814RP+, RS814+
13 series: RS10613xs+, RS3413xs+, DS2413+, DS1813+, DS1513+, DS713+
12 series: RS3412RPxs, RS3412xs, RS2212RP+, RS2212+, RS812RP+, RS812+, DS3612xs, DS1812+, DS1512+, DS412+
11 series: RS3411RPxs, RS3411xs, DS3611xs
Cost reduction

Cost reduction

Mitigate the impact of unexpected server malfunctions.

Service reliability

Service reliability

Keep your data and services available and online.

The risks of downtime


average cost per hour caused by IT downtime1


of companies do not survive after suffering catastrophic data loss2


of data loss incidents are caused by hardware failures3

Highly reliable architecture

Combine two identical Synology High Availability (SHA)-compatible Synology NAS to create a high-availability cluster.

Real-time protection
Minute-level failover

Keep critical workloads running

Ensure the continued operation of virtualization environments, setups running large numbers of concurrent applications, and resource-intensive deployments supporting critical services.

For virtualization

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

For virtualization

For highly available services

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

For highly available services

Set up for stability

Intuitive features help you further enhance the efficacy of your high-availability clusters.

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

Synology High Availability in action

Learn more


  1. Lerner, Andrew. “The Cost of Downtime.” Gartner,

  2. Wiggins, Dave. “Prevent Catastrophic Data Loss from Destroying Your Documents.” DocuVantage,

  3. Smith, David M. “The Cost of Lost Data.” Graziadio School of Business and Management | Pepperdine University,