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Abstract ▼ AI-Helper

Flash-memory based solid state drives (SSDs) are deployed widely for various areas induding laptop computers, PCs, and servers due to their diverse advantages. However, one of serious problems of current SSDs is low reliability originated from their primary component, flash-memory, having high error...

Flash-memory based solid state drives (SSDs) are deployed widely for various areas induding laptop computers, PCs, and servers due to their diverse advantages. However, one of serious problems of current SSDs is low reliability originated from their primary component, flash-memory, having high error rate and limited erase count. Adopting RAID architecture is a reasonable way to increase reliability of SSDs. However, the cost of parity update is a heavy burden for small write requests in SSDs using RAID architecture. To fundamentally solve this problem, in this paper, we propose Dynamic Striping-RAID (DS-RAID). Unlike RAID-5 that constructs a stripe based on LBNs (Logical Block Numbers), the DS-RAID dynamically constructs a stripe based on arrival order of write requests such that write requests are sequentially written to a stripe. Hence, the performance and lifetime of SSDs can be greatly improved by reducing read and write operations for parity updates. Additionally, we propose the sub-stripe parity scheme to increase reliability of data without non-volatile RAM. We implemented the DS-RAID scheme in DiskSim with SSD extension and experimental results of trace-driven simulation show that the DS-RAID outperforms conventional RAID-5 scheme in terms of performance and lifetime of SSDs.

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