The trouble is that these bonds may not be the best way to achieve diversification from bond allocations in an overall portfolio.

FORBES: Are Your Bond Holdings Raising Your Portfolio's Risk Profile?

Its approach to buy-outs has helped Carlyle raise funds, since the same investor can put more money its way and still get the diversification he wants.

ECONOMIST: The Carlyle Group

Another way to try to maintain better diversification if the market goes haywire is through investing in alternatives, such as managed futures.

FORBES: Using Your Investing Alternatives