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Hey. We've recently improved the wording in the retention documentation in this commit a bit: https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4568/files Perhaps this will make the documentation clearer. As for your questions, data beyond the retention period will not be read in queries otherwise it could produce non-consistent results. The maximum disk space usage for a given `-retentionPeriod` is going to be (`-retentionPeriod` + 1) months. If you had set the value to 3m, the March data would have been cleared in July, but 100d > 3m (in terms of month-partitioned storage, that equals 4 months), so the data won't be cleared until August.