The design and implementation of RAPID-cache for Linux

This paper presents the design and implementation of a different approach called RAPID-cache (redundant, asymmetrically parallel and inexpensive disk cache) for highly-reliable systems. In order to validate whether RAPID-cache can really achieve satisfactory performance in real systems, and to see if RAPID-cache can also improve the performance/reliability of the OS buffer cache, we have designed and implemented RAPID-cache for the Linux system. Measurement results using realistic benchmarks show very promising results. Using only 3.25 MB of NVRAM, a RAPID-Cache outperforms normal NVRAM caches of 64 MB or even 128 MB. RAPID-Cache also provide better reliability than normal NVRAM caches.