77 lines
2.4 KiB
Markdown
77 lines
2.4 KiB
Markdown
---
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title: Glossary
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aliases:
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- /enterprise/v1.6/concepts/glossary/
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menu:
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enterprise_influxdb_1_6:
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weight: 20
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parent: Concepts
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---
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## data node
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A node that runs the data service.
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For high availability, installations must have at least two data nodes.
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The number of data nodes in your cluster must be the same as your highest
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replication factor.
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Any replication factor greater than two gives you additional fault tolerance and
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query capacity within the cluster.
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Data node sizes will depend on your needs.
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The Amazon EC2 m4.large or m4.xlarge are good starting points.
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Related entries: [data service](#data-service), [replication factor](#replication-factor)
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## data service
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Stores all time series data and handles all writes and queries.
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Related entries: [data node](#data-node)
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## meta node
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A node that runs the meta service.
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For high availability, installations must have three meta nodes.
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Meta nodes can be very modestly sized instances like an EC2 t2.micro or even a
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nano.
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For additional fault tolerance installations may use five meta nodes; the
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number of meta nodes must be an odd number.
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Related entries: [meta service](#meta-service)
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## meta service
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The consistent data store that keeps state about the cluster, including which
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servers, databases, users, continuous queries, retention policies, subscriptions,
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and blocks of time exist.
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Related entries: [meta node](#meta-node)
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## replication factor
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The attribute of the retention policy that determines how many copies of the
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data are stored in the cluster.
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InfluxDB replicates data across `N` data nodes, where `N` is the replication
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factor.
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To maintain data availability for queries, the replication factor should be less
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than or equal to the number of data nodes in the cluster:
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* Data is fully available when the replication factor is greater than the
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number of unavailable data nodes.
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* Data may be unavailable when the replication factor is less than the number of
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unavailable data nodes.
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Any replication factor greater than two gives you additional fault tolerance and
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query capacity within the cluster.
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## web console
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Legacy user interface for the InfluxDB Enterprise.
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This has been deprecated and the suggestion is to use [Chronograf](/{{< latest "chronograf" >}}/introduction/).
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If you are transitioning from the Enterprise Web Console to Chronograf, see how to [transition from the InfluxDB Web Admin Interface](/chronograf/v1.7/guides/transition-web-admin-interface/).
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