Some problems with filecoin mining

  1. Now the test network mining is just a test, there will be no actual revenue right?
  2. I have prepared 100 dell R730 servers. Each machine has 12TB hard disks. If several servers fail during work, will it affect my income? Is there a penalty mechanism?

Yes, the current devnets are strictly for testing, with no real monetary value.

Yes, failure will affect income and there are penalty mechanisms. These mechanisms are currently in a bit of flux as we attempt to find the right balance of incentives. You can read the current state in the spec, but this is highly likely to change.