© 2013 Fusion-io, Inc. All rights reserved. Creating Flash-Aware Applications Nisha Talagala 2 Area Hard Disk Drives Flash Devices Logical to Physical Blocks Nearly 1:1 Mapping Remapped at every write Read/Write Performance Largely symmetrical Heavily asymmetrical. Additional operation (erase) Sequential vs Random Performance 100x difference. Elevator scheduling for disk arm <10x difference. No di