I don't know when it breaks. But I'm on a single medium sized Linode and doing full-text search over 120M small (< 1KB) to medium (< 10KB) text documents and i

I don't know when it breaks. But I'm on a single medium sized Linode and doing full-text search over 120M small (< 1KB) to medium (< 10KB) text documents and it's still so fast I'm not sure that I will ever need to consider an alternative.