Acknowledgements

We thank John Carmichael, then at Veritas Software Corp., for suggesting that we look into this area, Fred van den Bosch of Veritas for his help and interest, S. Roy of Veritas for providing valuable technical assistance while implementing the driver, John Wilkes of HP Labs for providing the traces, Vaishnav Malay for his help in deciphering the traces and Kameshwari for suggestions.