May I ask how big the AE full node now? If I want to run a full node, how much hard disk space need to be reserved？ 
I haven’t checked sizes lately - I think it’s somewhere around 120 - 140 GB for a full node.
But with the redesigned garbage collection, you should be able to run a node within ca 40 GB. Note that this number will slowly increase over time, since headers and blocks are continuously added, and aren’t garbage-collected.
The garbage collection options are documented here. If the chain:garbage_collection:during_sync option is enabled for a node being synced from scratch, the state trees will be continuously pruned even during sync. This will add ca 30% to the sync time, but the node’s disk footprint will stay within ca 40 GB.
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Great，thanks
Of course, you can also start a node from a database snapshot, found here:
The ‘light’ snapshots are garbage-collected, which is also apparent from their size.
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