Linux SSD caching (dm-cache)
The Linux 3.9 kernel (made available on April 28, 2013) introduces SSD caching. The kernel's Device mapper now includes a cache target called dm-cache that enables SSDs or other storage device to be used as a cache for a hard drive. It essentially speeds up data writes and reads as it allows the faster SSD to first cache data and then transfer it to the slower hard drive.
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