Do not use pruning in Hyperledger Besu v1.4.0. Pruning has a known bug.
If using fast sync in v1.4.0, explicitly disable pruning using
Use pruning to reduce storage required for the world state. Pruning removes state trie nodes that are not required.
Using pruning with private transactions is not supported.
Running a full sync to the Ethereum Mainnet with pruning enabled requires about 700GB of available
disk space. To enable pruning, use the
Pruning might increase block import times, but it does not affect the ability of nodes to stay in sync.