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docs/FAQ.md: add an answer for What is the difference between single-node and cluster versions of VictoriaMetrics?

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@ -235,6 +235,30 @@ It supports [high cardinality data](https://medium.com/@valyala/high-cardinality
perfectly [scales up on a single node](https://medium.com/@valyala/measuring-vertical-scalability-for-time-series-databases-in-google-cloud-92550d78d8ae)
and scales horizontally to multiple nodes.
## What is the difference between single-node and cluster versions of VictoriaMetrics?
Both [single-node](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html) and
[cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) versions of VictoriaMetrics
share the core source code, so they have many common features. They have the following differences though:
* [Single-node VictoriaMetrics](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html) runs on a single host,
while [cluster version of VictoriaMetrics](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) can scale to many hosts.
Single-node VictoriaMetrics scales vertically though, e.g. its capacity and performance scales almost linearly when increasing
available CPU, RAM, disk IO and disk space. See [an article about vertical scalability of a single-node VictoriaMetrics](https://valyala.medium.com/measuring-vertical-scalability-for-time-series-databases-in-google-cloud-92550d78d8ae).
* Cluster version of VictoriaMetrics supports [multitenancy](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multitenancy),
while single-node VictoriaMetrics doesn't support it.
* Cluster version of VictoriaMetrics supports data replication, while single-node VictoriaMetrics relies on the durability
of the persistent storage pointed by `-storageDataPath` command-line flag.
See [these docs](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#replication-and-data-safety) for details.
* Single-node VictoriaMetrics provides higher capacity and performance comparing to cluster version of VictoriaMetrics
when running on the same hardware with the same amounts of CPU and RAM, since it has no overhead on data transfer
between cluster components over the network.
See also [which type of VictoriaMetrics is recommended to use](#which-victoriametrics-type-is-recommended-for-use-in-production---single-node-or-cluster).
## Where can I ask questions about VictoriaMetrics?
Questions about VictoriaMetrics can be asked via the following channels:
@ -303,6 +327,11 @@ VictoriaMetrics maintains in-memory cache for mapping of [active time series](#w
See [this article](https://valyala.medium.com/how-to-optimize-promql-and-metricsql-queries-85a1b75bf986).
VictoriaMetrics also provides [query tracer](https://docs.victoriametrics.com/#query-tracing) and [cardinality explorer](https://docs.victoriametrics.com/#cardinality-explorer),
which can help during query optimization.
See also [troubleshooting slow queries](https://docs.victoriametrics.com/Troubleshooting.html#slow-queries).
## Which VictoriaMetrics type is recommended for use in production - single-node or cluster?
Both [single-node VictoriaMetrics](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html) and