Abstract
To
provide fault tolerance for cloud storage, recent studies propose to stripe
data across multiple cloud vendors. However, if a cloud suffers from a
permanent failure and loses all its data, we need to repair the lost data with the
help of the other surviving clouds to preserve data redundancy. We present a
proxy-based storage system for fault-tolerant multiple-cloud storage called NCCloud,
which achieves cost-effective repair for a permanent single-cloud failure.
NCCloud is built on top of a network-coding-based storage scheme called the
functional minimum-storage regenerating (FMSR) codes, which maintain the same fault
tolerance and data redundancy as in traditional erasure codes (e.g., RAID-6),
but use less repair traffic and, hence, incur less monetary cost due to data transfer.
One key design feature of our FMSR codes is that we relax the encoding
requirement of storage nodes during repair, while preserving the benefits of
network coding in repair. We implement a proof-of-concept prototype of NCCloud
and deploy it atop both local and commercial clouds. We validate that FMSR
codes provide significant monetary cost savings in repair over RAID-6 codes, while
having comparable response time performance in normal cloud storage operations
such as upload/download.
Domain : Cloud Computing
Contact Details
Ph. no : 7200555526
e-mail : info.nanosoftwares@gmail.com
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