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So, I want to migrate to gain disk space thanks to blockchain pruning (it seems that it goes from ~11.4 GiB to ~3.3 GiB) and try the difference of sync speed.
Is this already documented somewhere? (how to jump from the different ethereum implementations)
Is there something else than the private keys that might need to be migrated? If so, how to proceed?
Nothing special needs to be done. Private keys will be imported automatically.
On a typical machine, it will take around 1 hour to sync with the network.
No, you cannot import/export blockchain between geth and parity. However you can import/export wallets between clients.
To import to geth you can actually try the --fast command with geth. If it is to parity its only less than 2GB the entire blockchain.
This is documented at https://wiki.parity.io/Importing-a-Chain-from-Geth.html
In essence, you can create a fifo using mkfifo, and then run
geth export /tmp/yourfifo
Put that in the background, and import to parity using
parity import /tmp/yourfifo
This is for the blockchain itself, not the wallet (from my understanding).
geth exportto export the blockchain data usinggeth. But I don't know ifparitycan import the exported file though.rm -rf $ETHEREUM_DATADIR/chaindataand restart withgeth --fast, that should reduce the disk usage significantly.