Storage

CAVE: Channel-Aware Buffer Management Scheme for Solid State Disk

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Executive Summary

Exploiting a multi-channel architecture of Solid State Disk (SSD) is a role of Flash Translation Layer (FTL) until now. A multi-channel FTL scheme increases I/O parallelism by spreading out pages in a logical block to multiple channels. However, this scheme has high garbage collection overhead for reclaiming invalid pages, thus resulting in the performance degradation. In order to overcome this problem, the authors assign a write buffer to exploit a multi-channel architecture. In this paper, they propose a novel buffer management scheme, called Channel-Aware Victim Eviction (CAVE). The key idea of the CAVE scheme is to evict multiple victims whose number is equal to the number of NAND ash memories when a write buffer is full for increasing I/O parallelism.

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