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docs: update retention docs with additional details (#2060)

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Signed-off-by: hagen1778 <roman@victoriametrics.com>
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15
README.md
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@ -1144,16 +1144,21 @@ write data to the same VictoriaMetrics instance. These vmagent or Prometheus ins
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.
Data is split in per-month partitions inside `<-storageDataPath>/data/small` and `<-storageDataPath>/data/big` folders.
Data partitions outside the configured retention are deleted on the first day of new month.
Each partition consists of one or more data parts with the following name pattern `rowsCount_blocksCount_minTimestamp_maxTimestamp`.
Data parts outside of the configured retention are eventually deleted during [background merge](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282).
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.
It is safe to extend `-retentionPeriod` on existing data. If `-retentionPeriod` is set to lower
value than before then data outside the configured period will be eventually deleted.
VictoriaMetrics supports retention smaller than 1 month. For example, `-retentionPeriod=5d` would set data retention for 5 days.
Older data is eventually deleted during [background merge](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282).
Please note, time range covered by data part is not limited by retention period unit. Hence, data part may contain data
for multiple days and will be deleted only when fully outside of the configured retention.
It is safe to extend `-retentionPeriod` on existing data. If `-retentionPeriod` is set to lower
value than before then data outside the configured period will be eventually deleted.
## Multiple retentions

15
docs/README.md
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@ -1144,16 +1144,21 @@ write data to the same VictoriaMetrics instance. These vmagent or Prometheus ins
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.
Data is split in per-month partitions inside `<-storageDataPath>/data/small` and `<-storageDataPath>/data/big` folders.
Data partitions outside the configured retention are deleted on the first day of new month.
Each partition consists of one or more data parts with the following name pattern `rowsCount_blocksCount_minTimestamp_maxTimestamp`.
Data parts outside of the configured retention are eventually deleted during [background merge](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282).
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.
It is safe to extend `-retentionPeriod` on existing data. If `-retentionPeriod` is set to lower
value than before then data outside the configured period will be eventually deleted.
VictoriaMetrics supports retention smaller than 1 month. For example, `-retentionPeriod=5d` would set data retention for 5 days.
Older data is eventually deleted during [background merge](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282).
Please note, time range covered by data part is not limited by retention period unit. Hence, data part may contain data
for multiple days and will be deleted only when fully outside of the configured retention.
It is safe to extend `-retentionPeriod` on existing data. If `-retentionPeriod` is set to lower
value than before then data outside the configured period will be eventually deleted.
## Multiple retentions

15
docs/Single-server-VictoriaMetrics.md
View File

@ -1148,16 +1148,21 @@ write data to the same VictoriaMetrics instance. These vmagent or Prometheus ins
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.
Data is split in per-month partitions inside `<-storageDataPath>/data/small` and `<-storageDataPath>/data/big` folders.
Data partitions outside the configured retention are deleted on the first day of new month.
Each partition consists of one or more data parts with the following name pattern `rowsCount_blocksCount_minTimestamp_maxTimestamp`.
Data parts outside of the configured retention are eventually deleted during [background merge](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282).
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.
It is safe to extend `-retentionPeriod` on existing data. If `-retentionPeriod` is set to lower
value than before then data outside the configured period will be eventually deleted.
VictoriaMetrics supports retention smaller than 1 month. For example, `-retentionPeriod=5d` would set data retention for 5 days.
Older data is eventually deleted during [background merge](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282).
Please note, time range covered by data part is not limited by retention period unit. Hence, data part may contain data
for multiple days and will be deleted only when fully outside of the configured retention.
It is safe to extend `-retentionPeriod` on existing data. If `-retentionPeriod` is set to lower
value than before then data outside the configured period will be eventually deleted.
## Multiple retentions