Synology DS1621xs Synology High Availability s White Paper
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- Synology DS1621xs | Synology High Availability s White Paper - Page 1
White Paper Synology High Availability White Paper Based on DSM 7.0.1 1 Synology White Paper - Synology DS1621xs | Synology High Availability s White Paper - Page 2
Table of Contents Introduction 02 Overview 03 Synology High Availability Architecture 04 Hardware Components Network Interface Network Scenarios Data Replication Special Conditions Achieving Service Continuity 09 Auto-Failover Protection Best Practices for Deployment 11 System - Synology DS1621xs | Synology High Availability s White Paper - Page 3
downtime becomes a potentially fatal problem costing companies as much as over 12,000 USD a day. With the growing demand for uninterrupted availability, businesses seek for solutions that ensure high levels of service continuity. Synology Solutions for Service Continuity High availability solution - Synology DS1621xs | Synology High Availability s White Paper - Page 4
comes with built-in, visualized management tools • Complete protection for file services including SMB, AFP, NFS, FTP, iSCSI, Synology Active Directory, Fibre Channel, and the DSM login page. • Supports uninterrupted updates of the Synology High Availability package. This white paper aims to provide - Synology DS1621xs | Synology High Availability s White Paper - Page 5
Availability solution is a server layout designed to reduce service interruptions caused by system malfunctions. It employs two servers to form a "high-availability cluster" (also called "HA cluster") consisting of two compatible Synology servers. Once this high-availability cluster is formed, one - Synology DS1621xs | Synology High Availability s White Paper - Page 6
a single namespace. Therefore, when a switchover is triggered and the provision of services is moved to the passive server, there will be no need to modify Additional cluster interfaces can be added on the Network page in Synology High Availability. One of the cluster interfaces is designated as - Synology DS1621xs | Synology High Availability s White Paper - Page 7
the switch connected to the active server or the switch fails, service continuity will be maintained by switching over to the passive server ( the connections are healthy. Path Redundancy for the Heartbeat Connection For Synology NAS models with four or more network ports, link aggregation may be - Synology DS1621xs | Synology High Availability s White Paper - Page 8
switch/router. User are advised to manually enable/disable the flow control if Services: High-availability clustering supports iSCSI, including iSCSI LUN and iSCSI Target services. • DSM and Other Services: Management applications, including Synology DiskStation Manager (DSM) and its other services - Synology DS1621xs | Synology High Availability s White Paper - Page 9
indicating when the server became active. The information should be found in Synology High Availability or the read-only File Station. Thus, users would be choose one server to be the new active server and resume high availability services right away (the data on the new passiver server will be over- - Synology DS1621xs | Synology High Availability s White Paper - Page 10
Continuity Achieving Service Continuity Auto-Failover Protection To ensure continuous availability, Synology High Availability allows switching from the active server to the passive server in a normally functioning high-availability cluster at any time. Switchover can be manually triggered for - Synology DS1621xs | Synology High Availability s White Paper - Page 11
will have to be manually attached onto the passive server power units on the passive server malfunction, or if power is lost for any other reason. • DSM update: When installing DSM updates, all services will be stopped and then come online after DSM update installation is completed 10 Synology - Synology DS1621xs | Synology High Availability s White Paper - Page 12
environment complies with the basic requirements for Synology High Availability. Both servers must be RAM module configuration, both servers must have the same number of attached network interface cards and LAN ports. System Performances To meet the needs of operating performance-intensive services - Synology DS1621xs | Synology High Availability s White Paper - Page 13
Synology NAS servers. However, aside from the NAS storage itself, the normal operation of the whole services also depends on a couple of other factors, including stable network connections and power supply case that a problem occurs with external network interface card 1, all services can still be - Synology DS1621xs | Synology High Availability s White Paper - Page 14
Brain Prevention with Quorum Server In a real implementation of Synology High Availability, there are a certain number of possibilities while the failover from active server is not triggered. Both servers may assume the services at the same time and, in this case, the splitbrain occurs. To avoid - Synology DS1621xs | Synology High Availability s White Paper - Page 15
Benchmark Performance Benchmark Performance Considerations Synology High Availability employs the - Write iSCSI - 4KB Random IOPS - Read iSCSI - 4KB Random IOPS - Write SHA1 Standalone SA3600 DSM 7.0.1 10GbE *1 N/A 10GbE *1 N/A Btrfs 12 SSD (960 GB) with RAID 5 1180.3 1180.5 1179 - Synology DS1621xs | Synology High Availability s White Paper - Page 16
loading of services on the cluster The following table provides estimated time-to-completion: Settings Switchover Failover DS920+ 64 62 SA3600 30 31 • Unit: second • Switchover is triggered manually in the Synology High Availability package. • Failover is triggered by unplugging the power cord - Synology DS1621xs | Synology High Availability s White Paper - Page 17
when acquiring Synology NAS. Synology High Availability (SHA) provides a cost-effective and reliable means of ensuring against service downtime while deployment, please contact Synology at www.synology.com. More Resources • DSM Live Demo: Take advantage of our free 30-minute DSM 7.0 trial session. - Synology DS1621xs | Synology High Availability s White Paper - Page 18
specifications and product descriptions at any time, without notice. Copyright © 2019 Synology Inc. All rights reserved. ® Synology and other names of Synology Products are proprietary marks or registered trademarks of Synology Inc. Other products and company names mentioned herein are trademarks of
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White Paper
Based on
DSM 7.0.1
Synology High Availability
White Paper