A Review of Disc Scrubbing and Intra Disk Redundancy for Reducing Data Loss in Disk FileSystems

摘要

Because of high demand that applications and new technologies have today for data storage capacity, more disk drives are needed, resulting in increased probability to inaccessible sectors, referred as Latent Sector Errors. Aiming to reduce data loss by LSE, two main techniques are extensively studied lately: Disk Scrubbing, which performs reading operations during idle periods on systems to search for errors and Intra Disk Redundancy which is based on redundancy codes. Based on previous evaluation results, we discuss and introduce the benefits on using both schemes simultaneously: combining different IDR coding schemes with different scrubbing strategies in particular regions that store crucial data. Finally, we apply a dynamic scheduling algorithm for a minimum impact on system performance.