Monday, October 14, 2013

Flashcache at Facebook: From 2010 to 2013 and beyond


We recently released a new version of Flashcache, kicking off the flashcache-3.x series. We’ve spent the last few months working on this new version, and our work has resulted in some performance improvements, including increasing the average hit rate from 60% to 80% and cutting the disk operation rate nearly in half.

History of Flashcache at Facebook

Facebook first started using Flashcache in 2010. At the time, we were trying to find a way around having to choose between a SAS or SATA disk-based solution and a purely flash-based solution. None of the options were ideal: The SAS and SATA options in 2010 were slow (SATA) or required many disks (SAS), and the cost per gigabyte for flash in 2010 was high.

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