Solid State Disk Object-Based Storage with Trim Commands

TL;DR

This paper models NAND flash SSD utilization and write amplification considering the Trim command within object-based storage, analyzing various workloads and proposing model modifications for optimization.

Contribution

It introduces a modified analytical model for SSD write amplification that incorporates object-based storage and Trim commands, extending existing models.

Findings

Analytic model aligns well with simulation results.

Trim command reduces write amplification in object storage.

Object size diversity impacts SSD utilization and performance.

Abstract

This paper presents a model of NAND flash SSD utilization and write amplification when the ATA/ATAPI SSD Trim command is incorporated into object-based storage under a variety of user workloads, including a uniform random workload with objects of fixed size and a uniform random workload with objects of varying sizes. We first summarize the existing models for write amplification in SSDs for workloads with and without the Trim command, then propose an alteration of the models that utilizes a framework of object-based storage. The utilization of objects and pages in the SSD is derived, with the analytic results compared to simulation. Finally, the effect of objects on write amplification and its computation is discussed along with a potential application to optimization of SSD usage through object storage metadata servers that allocate object classes of distinct object size.