Paper Info
Title
Effect of Latent Errors on the Reliability of Data Storage Systems
Abstract
The reliability of data storage systems is adversely affected by the presence of latent sector errors. As the number of occurrences of such errors increases with the storage capacity, latent sector errors have become more prevalent in today's high capacity storage devices. Such errors are typically not detected until an attempt is made to read the affected sectors. When a latent sector error is detected, the redundant data corresponding to the affected sector is used to recover its data. However, if no such redundant data is available, then the data of the affected sector is irrecoverably lost from the storage system. Therefore, the reliability of data storage systems is affected by both the complete failure of storage nodes and the latent sector errors within them. In this article, closed-form expressions for the mean time to data loss (MTTDL) of erasure coded storage systems in the presence of latent errors are derived. The effect of latent errors on systems with various types of redundancy, data placement, and sector error probabilities is studied. For small latent sector error probabilities, it is shown that the MTTDL is reduced by a factor that is independent of the number of parities in the data redundancy scheme as well as the number of nodes in the system. However, for large latent sector error probabilities, the MTTDL is similar to that of a system using a data redundancy scheme with one parity less. The reduction of the MTTDL in the latter case is more pronounced than in the former one.
Year
DOI
Venue
2013
10.1109/MASCOTS.2013.38
MASCOTS
Keywords
Field
DocType
data storage systems,storage system,data redundancy scheme,data loss,large latent sector error,affected sector,latent errors,data storage system,data placement,latent error,redundant data,latent sector error,redundancy
Data mining,Expression (mathematics),Computer data storage,Computer science,Real-time computing,Data redundancy,Redundancy (engineering),Storage management,Mean time to data loss,Parity (mathematics),Erasure
Conference
ISSN
Citations 
PageRank 
1526-7539
5
0.45
References 
Authors
12
2
Name
Order
Citations
PageRank
Vinodh Venkatesan1627.82
I. Iliadis226926.31