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Disk Space Optimization

Blockchain databases tend to grow over time, depending e.g. on block speed and transaction amount. For Echelon, we are talking about close to 100GB of disk usage in the first two weeks.
There are a few configurations that can be done to reduce the required disk usage quite significantly. Some of these changes take full effect only when you do the configuration and start syncing from start with them in use.
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Logging

By default the logging level is set to info, and this produces a lot of logs. This log level might be good when starting up to see that the node starts syncing properly. However, after you see the syncing is going smoothly, you can lower the log level to warn (or error). On config.toml set the following
log_level = "warn"
Also ensure your log rotation is configured properly.

Indexing

If you do not need to query transactions from the specific node, you can disable indexing. In config.toml set
indexer = "null"
If you do this on already synced node, the collected index is not purged automatically, you need to delete it manually. The index is located under the database directory with name data/tx_index.db/.

State-sync snapshots

This is disabled by default with Echelon, but listing it in any case here. On app.toml set
snapshot-interval = 0
Note that if state-sync was enabled on the network and working properly, it would allow one to sync a new node in few minutes. But this node would not have the transaction and block history.

Configure pruning

By default every 500th state, and the last 100 states are kept. This consumes a lot of disk space on long run, and can be optimized with following custom configuration:
pruning = "custom" pruning-keep-recent = "100" pruning-keep-every = "0" pruning-interval = "10"
Configuring pruning-keep-recent = "0" might sound tempting, but this will risk database corruption if the echelond is killed for any reason. Thus, it is recommended to keep the few latest states.
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