How to sync a prune node from an archive node/snapshot given storage limitations?

[Arisawa-v]

Hello, I’m currently syncing an archive node and facing some storage-space constraints. I have two questions:

1. I’m in the middle of syncing an archive node, but I’m running out of storage. Can I interrupt this process and restart syncing as a pruned node instead?

2. If restarting as a pruned node is not advisable, then I plan to download an archive snapshot but configure the node from the start to run in pruned-mode. In that scenario:

• During the sync process, will the pruned node delete (“prune”) parts of the snapshot data while syncing (thus freeing space earlier)?

• Or does the snapshot get fully written before pruning kicks in, meaning I still need enough space to handle the full snapshot first (and so I may still run out of space)?

Thanks in advance for any guidance — I want to make sure I set things up correctly given my storage limitations.

[Arisawa-v]

I also notice reth prune is a valid command. Can I use it to prune an under-syncing node? or I can only use it to prune a synced node?

[figtracer]

no, you can't switch between node types after it starts syncing. this is stated at https://reth.rs/run/faq/pruning/

The node type that was chosen when first running a node cannot be changed after the initial sync. Turning Archive into Pruned, or Pruned into Full is not supported.

afaik, restoring from a snapshot still requires space in memory, Reth needs to ingest the full snapshot before it begins to sync