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Theoretically total bandwidth conserving locality in Distributed Storage System
KTH, School of Electrical Engineering (EES), Communication Theory.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Distributed storage systems provide fast and reliable access to data by intro-

ducing redundancy for stored les. The most common approach of adding re-

dundant information is by repetition and erasure codes. Two main processes

in a distributed storage system are reconstruction of original le and regenerat-

ing a new node. These two processes require bandwidth, which are termed as

reconstruction-bandwidth and repair-bandwidth. The current literature treat-

s these two processes separately. That is, there are methods to reduce the

reconstructing bandwidth without considering the repair-bandwidth, and also

there are methods to reduce the repair-bandwidth. We study these two pro-

cesses together and try to jointly minimize the reconstruction-bandwidth and

repair-bandwidth. We observe a method that has the minimum reconstruction-

bandwidth might have large amount of repair-bandwidth and vice versa. We

propose codes which minimizes the sum of the repair-bandwidth and reconstruction-

bandwidth.

The main contribution of this thesis is nding an value of repair locality

r

(number of nodes connected during node repair) and devising two coding meth-

ods in which total bandwidth approximates to be half reduced compared with

MSR and MBR when k ! 1 under the condition that 1 6 r 6 k.

Place, publisher, year, edition, pages
2014. , 44 p.
Series
EES Examensarbete / Master Thesis, XR-EE-KT 2014:008
Keyword [en]
Minimum-Storage Regenerating (MSR), Minimum-Bandwidth Regenerating (MBR), repair locality
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-160952OAI: oai:DiVA.org:kth-160952DiVA: diva2:792814
Educational program
Master of Science - Wireless Systems
Examiners
Available from: 2015-03-05 Created: 2015-03-05 Last updated: 2015-03-05Bibliographically approved

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CiteExportLink to record
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