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docs: add more details about data migration between VictoriaMetrics (#2294)

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* docs: add more details about data migration between VictoriaMetrics

https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2290
Signed-off-by: hagen1778 <roman@victoriametrics.com>

* Update README.md
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Roman Khavronenko 2022-03-10 11:06:31 +02:00 committed by GitHub
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@ -1455,6 +1455,27 @@ See the full description of flags [here](#list-of-command-line-flags).
## Data migration
### From VictoriaMetrics
The simplest way to migrate data from one single-node (source) to another (destination), or from one vmstorage node
to another do the following:
1. Stop the VictoriaMetrics (source) with `kill -INT`;
2. Copy (via [rsync](https://en.wikipedia.org/wiki/Rsync) or any other tool) the entire folder specified
via `-storageDataPath` from the source node to the empty folder at the destination node.
3. Once copy is done, stop the VictoriaMetrics (destination) with `kill -INT` and verify that
its `-storageDataPath` points to the copied folder from p.2;
4. Start the VictoriaMetrics (destination). The copied data should be now available.
Things to consider when copying data:
1. Data formats between single-node and vmstorage node aren't compatible and can't be copied.
2. Copying data folder means complete replacement of the previous data on destination VictoriaMetrics.
For more complex scenarios like single-to-cluster, cluster-to-single, re-sharding or migrating only a fraction
of data - see [vmctl. Migrating data from VictoriaMetrics](https://docs.victoriametrics.com/vmctl.html#migrating-data-from-victoriametrics).
### From other systems
Use [vmctl](https://docs.victoriametrics.com/vmctl.html) for data migration. It supports the following data migration types:
* From Prometheus to VictoriaMetrics