On the Impact of Disk Scrubbing on Energy Savings
نویسندگان
چکیده
The increasing use of computers for saving valuable data imposes stringent reliability constraints on storage systems. Reliability improvement via use of redundancy is a common practice. As the disk capacity improves, advanced techniques such as disk scrubbing are being employed to proactively fix latent sector errors. These techniques utilize the disk idle time for reliability improvement. However, the idle time is a key to dynamic energy management that detects such idle periods and turns-off the disks to save energy. In this paper, we are concerned with the distribution of the disk idle periods between reliability and energy management tasks. For this purpose, we define a new metric, energy-reliability product (ERP ), to capture the effect of one technique on the other. Our initial investigation using trace-driven simulations of typical enterprise applications shows that the ERP is a suitable metric for identifying efficient idle period utilization. Thus, ERP can facilitate development of systems that provide both reliability and energy managements.
منابع مشابه
A Review of Disc Scrubbing and Intra Disc Redundancy Techniques for Reducing Data Loss in Disc File Systems
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 (LSE). 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 ...
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