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Abstract
The focus of this project is a hybrid file system, with the declared purpose of accelerating file access time and a possible improvement of power usage through the combined usage of random-access memory, solid-state drives and hard disk drives.
The idea is simple: use the fast memory (RAM and SSD) as a two-level cache. The most accessed files will be stored into RAM, while the medium accessed files will reside in the SSD. When a file is not located into the cache memory, a cache miss event takes place and data is read from the hard drive.
By using the SSD as a level 2 cache, large files can be accessed very fast (as compared to the HDD). Large files cannot typically be held into a RAM disk, as its capacity can be easily filled. Current SSD models have capacities of 120 GB and reading speeds of up to 250 MB/s. This is well beyond what a high speed hard drive can offer (Western Digital Velociraptor topping at ~100 MB/s).
Performance tu
