Collector high availability (HA)
A collector HA cluster consists of an active master unit and one or more standby slave units.
The portal controls the collector HA cluster and polls the collectors (using HTTPS) every 30 seconds to check that they are active. If the master unit becomes unavailable, the portal automatically selects (using a simple round-robin algorithm) which standby slave becomes the new master without the need for human intervention. There is no loss of data between when the master unit becomes unavailable and the new master becomes active because all collectors receive the same data.
When a new master unit becomes active, you will see the following alert:
New Primary was elected: CollectorNN[xxx.xxx.xxx.xxx]
For example:
New Primary was elected: Collector10[192.15.50.108]
Use the following steps to create a high-availability cluster:
- Add one collector with the mode set to Master.
- Select the HA icon in the mode column to open the Cluster Information window.
- Select Add Slave to create the slave.