The vRealize Log Insight virtual appliance uses a minimum of 100GB of storage for incoming logs.
When the volume of logs imported into vRealize Log Insight reaches the 100GB limit, old log messages are automatically and periodically retired on a first-come-first-retired basis. To preserve old messages, you can enable the archiving feature of vRealize Log Insight. See Enable or Disable Data Archiving in vRealize Log Insight.
Data stored by vRealize Log Insight is immutable. After a log has been imported, it cannot be removed until it is automatically retired.