Storage

HybridStore: A Cost-Efficient, High-Performance Storage System Combining SSDs and HDDs

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Executive Summary

Unlike the use of DRAM for caching or buffering, certain idiosyncrasies of NAND Flash-based Solid-State Drives (SSDs) make their integration into existing systems non-trivial. Flash memory suffers from limits on its reliability, is an order of magnitude more expensive than the magnetic Hard Disk Drives (HDDs), and can sometimes be as slow as the HDD (due to excessive Garbage Collection (GC) induced by high intensity of random writes). Given these trade-offs between HDDs and SSDs in terms of cost, performance, and lifetime, the current consensus among several storage experts is to view SSDs not as a replacement for HDD but rather as a complementary device within the high-performance storage hierarchy.

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