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ReHypar: a recursive hybrid chunk partitioning method using NAND-flash memory SSD.

Jaechun No¹, Sung-Soon Park², Cheol-Su Lim³

¹College of Electronics and Information Engineering, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul 143-747, Republic of Korea.

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|July 3, 2014

Summary

ReHypar improves Solid State Drive (SSD) space utilization in hybrid storage systems. This recursive hybrid chunk partitioning method reduces fragmentation and enhances performance, making SSDs more cost-effective.

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Area of Science:

Computer Science
Data Storage Technologies

Background:

Solid State Drives (SSDs) offer high performance but are expensive compared to Hard Disk Drives (HDDs).
Hybrid storage systems combining SSDs and HDDs are a cost-effective solution, but maximizing SSD space utilization is crucial for performance.

Purpose of the Study:

To develop a novel method, ReHypar (recursive hybrid chunk partitioning), for enhancing SSD space utilization in hybrid storage.
To mitigate fragmentation overhead and improve the cost-effectiveness of SSDs in hybrid storage architectures.

Main Methods:

Developed ReHypar, a recursive hybrid chunk partitioning algorithm.
Implemented ReHypar to reuse remaining free space within I/O units.
Enabled configuration of multiple logical data sections within the SSD address space, each with different I/O units.
Integrated ReHypar with ext2 and ext4 file systems.

Main Results:

ReHypar effectively mitigates fragmentation overhead in SSD address space.
The method demonstrates improved space utilization of SSDs within hybrid storage configurations.
Evaluations using IOzone and Postmark benchmarks validated the performance benefits.

Conclusions:

ReHypar offers a significant improvement in SSD space utilization for hybrid storage systems.
The developed partitioning strategy enhances the cost-effectiveness and performance of hybrid storage solutions.
ReHypar presents a viable approach for optimizing SSD usage in conjunction with HDDs.