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My computer crashed 2 times Since your computer crashed, you are no longer fast syncing. So as crazy as it may sound, deleting the blockchain with geth removedb and restarting geth --rpc --fast …

This is a community wiki, with the hope that it can be updated by the community as developments take place. Here's latest from Ethereum Core developer Péter: karalabe [Ethereum] - Péter Szilágyi Hi, …

You need to use an SSD. Q: Wait, so I can’t run a full node on an HDD? A: Unfortunately not. Doing a fast sync on an HDD will take more time than you’re willing to wait with the current data schema. …

Péter provides the answer to the general question about transactions. In practical terms, when using a wallet, a sender of Ether needs to be in sync, otherwise the wallet may generate an invalid tran …

Use --fast and don't forget --cache with Geth Everyone mentions --fast but you probably also need --cache=1024 (and --jitvm may also help). Without it, you are running with the default which is --ca …

As there appears to have been some corruption, now that Avast is off, I would suggest deleting the chaindata and then running Mist again. The default datadir is: Mac: ~/Library/Ethereum Linux: ~/.et …

I've seen this "looping" behavior in the past and I would suggest deleting the chaindata and then running geth --fast --cache=1024. The default datadir is: Mac: ~/Library/Ethereum Linux: ~/.ethereum …

For Geth, in another terminal, attach to the Geth console, such as geth attach. This will allow you to keep your syncing node running, without restarting, and you will not see the noisy logs as you w …

No, you need to use an SSD. Q: Wait, so I can’t run a full node on an HDD? A: Unfortunately not. Doing a fast sync on an HDD will take more time than you’re willing to wait with the current data sche …

geth --maxpeers 0 will not sync. geth --maxpeers 0 console may be more helpful and will bring you the console: you don't even need the RPC, and can paste in and execute Javascript.

Don't forget to use an SSD If you're able to, using an NVMe SSD is even better. If you have limited space on SSD see Can chaindata be split across two (or more) locations? That said, the Ethereum stat …

Receiving ether is like receiving email: you don't need to be "on" to receive. One of the main differences is that everyone in the network has a copy of everything that's happened (all transactions, …

No As long as you control your private keys, your balance will not be affected. You will see your full balance when the syncing is finished. See How do I backup my ether accounts?

Good you checked the time, but the most common reason for failing to find peers is firewall and network configuration. If a firewall is running, try disabling it.

One idea could be to use sha3 (of the document) for docId. The mapping would become: mapping (bytes32 => Document) documents; sha3 is the cheapest hash function.