Syncing the Ethereum blockchain with Geth in --fast mode has two phases running in parallel: block sync and state trie download. Both phases need to be done in order to have a full node and switch to full mode where every transaction is executed and verified.
The block sync downloads all the block information (header, transactions). This phase uses a lot of ...
If you can't synchronize now I don't think there is any trick to get it synchronized with your current sync mode. But various sync modes require different amounts of disk space so you could check those out - for example light sync might work for you.
Clients get performance boosts every now and then with new versions so you can try updating to the latest ...
I am new to ethereum, but here's my understanding.
First, nodes and miners are different types of objects in ethereum network. For example, nodes run geth or parity, and miners run ethminer. One node could have a pool of miners to distribute PoW computation.
Each node connects to several peer nodes. A client (e.g. wallet app) creates transactions and ...
run parity -lsync=trace
looking for: "IO Worker #3 TRACE sync Checking snapshot sync: X (peer: Y)"
Search for the largest number Y in (peer: Y)
then copy X
stop parity and remove -lsync=trace
open ".../.local/share/io.parity.ethereum/config.toml "
and update config.toml with warp_barrier = X
run : parity
Every chain is a different network with a different network ID to identify them. When you sync a chain (mainnet in your case), your data will be saved in a datadir along with the configuration of the chain and the first block. When you try to sync another chain to the same datadir, they would start with a different block (the genesis block), and you'll ...
They are completely separate networks, they just utilize the same protocols but have completely different state. So you have to synchronize both separately. Synchronizing one will not influence the other, although depending on your hardware you may not be able to keep both networks synchronized at the same time.