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docs/Single-server-VictoriaMetrics.md: update Retention section

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Aliaksandr Valialkin 2020-01-27 18:44:21 +02:00
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@ -85,6 +85,7 @@ Cluster version is available [here](https://github.com/VictoriaMetrics/VictoriaM
- [Federation](#federation) - [Federation](#federation)
- [Capacity planning](#capacity-planning) - [Capacity planning](#capacity-planning)
- [High availability](#high-availability) - [High availability](#high-availability)
- [Retention](#retention)
- [Multiple retentions](#multiple-retentions) - [Multiple retentions](#multiple-retentions)
- [Downsampling](#downsampling) - [Downsampling](#downsampling)
- [Multi-tenancy](#multi-tenancy) - [Multi-tenancy](#multi-tenancy)
@ -657,6 +658,16 @@ If you have Prometheus HA pairs with replicas `r1` and `r2` in each pair, then c
to write data to `victoriametrics-addr-1`, while each `r2` should write data to `victoriametrics-addr-2`. to write data to `victoriametrics-addr-1`, while each `r2` should write data to `victoriametrics-addr-2`.
### Retention
Retention is configured with `-retentionPeriod` command-line flag. For instance, `-retentionPeriod=3` means
that the data will be stored for 3 months and then deleted.
Data is split in per-month subdirectories inside `<-storageDataPath>/data/small` and `<-storageDataPath>/data/big` folders.
Directories for months outside the configured retention are deleted on the first day of new month.
In order to keep data according to `-retentionPeriod` max disk space usage is going to be `-retentionPeriod` + 1 month.
For example if `-retentionPeriod` is set to 1, data for January is deleted on March 1st.
### Multiple retentions ### Multiple retentions
Just start multiple VictoriaMetrics instances with distinct values for the following flags: Just start multiple VictoriaMetrics instances with distinct values for the following flags: