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NetVisor UNUM High Capacity User Guide: 2022.6.3.2
HA Considerations - Cluster
Cluster / Data Node Health:
Green Cluster is fully operational with replicated data.
Yellow Cluster is fully operational data is being replicated.
Red Cluster is operational data has been lost.
Failure of any one Server Node B, C, or D:
Upon failure or removal of any one Server node B, C, or D, the Arista NetVisor UNUM High Capacity
Appliance will redistribute data such that no data will be lost.
The Cluster will temporarily go to Yellow, then will recover to Green after data is fully redistributed.
Redistribution of data times will vary depending on system / traffic load.
Normal operation can continue; however, the system is operating in a non-redundant configuration.
The failed or removed Server node, must be replaced as soon as possible.
Failure of more than one Server Node B, C, or D:
Upon failure or removal of more than one Server node B, C, or D will likely result in permanent data loss.
Two of the three Server nodes B, C, and D must be operational for the system to collect, manage and store
data properly.
Upon data loss the Cluster status will likely go Red and require replacement of failed or removed Server
nodes until at a minimum, two of the three are replaced.
Failure of Server Node A:
Upon failure or removal of the Primary Server node A, data will not be lost, however data collection and
connectivity to Arista NetVisor UNUM will stop.
The Primary Server node A must be replaced as soon as possible for normal operation to resume.
