Marcos Kawazoe Aguilera Kimberly Keeton Arif Merchant Kiran-Kumar Muniswamy-Reddy Mustafa Uysal Improving Recoverability in Multi-tier Storage Systems. 677-686 2007 conf/dsn/2007 DSN http://doi.ieeecomputersociety.org/10.1109/DSN.2007.57 db/conf/dsn/dsn2007.html#AguileraKMMU07