In this story, we'll follow the life story of alice - a file-systemized I/O request, and bob - a raw-device I/O request, from their birth, until they reach heaven (the disk or the USB camera or...). In addition, we will cover some system parameters that affect I/O requests, the buffer cache, disk I/O schedulers and tools used to track and count I/O (including - why is process-based I/O accounting so tricky).
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