[Animats]

If soft errors are rare, parity checking, without correction, might be more useful. It's better to have a server fail hard than make errors. In a "cloud" service, the systems are already in place to handle a hard failure and move the load to another machine. Unambiguous hardware failure detection is exactly what you want.

[mehrdada]

In practice, you basically get one-bit error correction 'for free' when you have enough redundancy to detect two-bit soft errors. Simple parity can only detect one bit flip, so if you want to catch two-bit errors, you might as well correct one-bit errors you find on your way at no extra cost.