Synology SA3200D Synology High Availability SHA User Guide for DSM 7.0 - Page 23

Monitored services, 3.6 Quorum server, Synology High Availability, Service

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Chapter 3: Set Up and Configure an SHA Cluster 3.5 Monitored services Select the services that you want to monitor with Synology High Availability. If a monitored service fails on the active server, the system will fail over to the passive server as long as it is operating normally. 3.6 Quorum server Quorum servers can help reduce the possibility of split-brain errors. On the Service page, you can assign another server as the quorum server, which will constantly connect to both the active and passive servers. A gateway server or a DNS server would both be appropriate examples for the quorum server, since they are able to connect to both the active and passive servers. The quorum server is meant to provide Ping services only, so no applications are required to be installed. A quorum server will allow for the following situations: • If the passive server cannot connect to both the active and quorum servers, failover will not be performed in order to prevent split-brain errors. • If the active server cannot connect to the quorum server while the passive server can, switchover will be triggered in order to ensure better availability. 21

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Chapter 3: Set Up and Configure an SHA Cluster
3.5 Monitored services
Select the services that you want to monitor with
Synology High Availability
. If a monitored
service fails on the active server, the system will fail over to the passive server as long as it is
operating normally.
3.6 Quorum server
Quorum servers can help reduce the possibility of split-brain errors. On the
Service
page,
you can assign another server as the
quorum server
, which will constantly connect to both
the active and passive servers. A gateway server or a DNS server would both be appropriate
examples for the quorum server, since they are able to connect to both the active and passive
servers. The quorum server is meant to provide Ping services only, so no applications are
required to be installed.
A quorum server will allow for the following situations:
• If the passive server cannot connect to both the active and quorum servers, failover will not
be performed in order to prevent split-brain errors.
• If the active server cannot connect to the quorum server while the passive server can,
switchover will be triggered in order to ensure better availability.