Bcache

Bcache is a Linux kernel block layer cache. It allows one or more fast disk drives such as flash-based solid state drives (SSDs) to act as a cache for one or more slower disk drives.

Kernel
Activate the following kernel options:

Emerge
Install :

External resources

 * Howto bcache - A Gentoo Forums thread on using bcache.
 * Arch wiki - The Bcache article on found on the Arch wiki.
 * Patrick's Blog -, a Gentoo developer, wrote a few short entries on his blog concerning the use of bcache and a multi-disk SATA array back in September, 2014. Read about it here.
 * Pommi's blog - SSD caching using Linux and bcache - A 2013 blog entry containing details of setting up bcache.