This parameter controls how old warm (mounted) partitions can get before they are unmounted or deleted.

Default: 30

When threshold is reached, the oldest partition is either unmounted (converted to cold) or deleted from disk, based on the value of AlwaysDeleteColdPartitions.

This setting can affect the availability of process data for sensors that have not checked in recently. See CacheDbWriteBatchSize.

Note: Beginning with version 6.1, the behavior of the parameter is affected by the AlwaysDeleteColdPartitions parameter.

Partition age is not determined by the timestamp of the partition itself, which is assigned at the partition start time . Instead, partition end time is used for this purpose, and this is determined by the timestamp of the next partition in line.