Lightweight Redundancy for Photos in Disk Array

Disk arrays store data across multiple disks and incorporate redundancy to protect against disk failures. With the widespread use of smartphones, users often accumulate large collections of photos. Although the JPG format (introduced in 1992) remains the most widely used image format, recent advancements in image coding have led to new formats like WEBP with better compression efficiency. In this paper, we leverage these advancements and propose a lightweight redundancy method to store photos in a disk array. This method transcodes photos into a new format with better compression efficiency and determines redundancy based on the transcoded photos, resulting in smaller redundancy. The proposed method allows users to have fine-grained control over the tradeoff between necessary redundancy and the quality of photos recovered from disk failures.