Investigating the Reliability in Three RAID Storage Models and Effect of Ordering Replicas on Disks

TL;DR

This paper compares the reliability of three RAID storage models with identical components but different redundancy arrangements, analyzing how redundancy type and block ordering affect overall system reliability in cloud storage.

Contribution

It provides a comparative analysis of three RAID models' reliability, highlighting the impact of redundancy type and arrangement on fault tolerance in cloud storage systems.

Findings

Different RAID models exhibit varying levels of fault tolerance.

Redundancy arrangement significantly influences system reliability.

Reliability analysis using RBD clarifies the effects of redundancy types.

Abstract

One of the most important parts of cloud computing is storage devices, and Redundant Array of Independent Disks (RAID) systems are well known and frequently used storage devices. With the increasing production of data in cloud environments, we need high-reliable storage, given the importance of data. RAID system's reliability analysis is of particular significance in the area of cloud storage. Generally, data redundancy is used to create fault tolerance and increases the reliability of storage. This study has considered three examples of the simple RAID storage models and analyzed their reliability. All of which have a replication factor of two and have the same number of disks and reliabilities. The only difference is the model that they used for generating the redundancy. To compare these three models' reliability, we examined the degree of fault tolerance (FT) and calculated the models' reliability using the reliability block diagram (RBD). In this paper, the effect of redundancy's type and the blocks' arrangement on the system's reliability was investigated.