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Extensible block-level storage virtualization in cluster-based systems
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DOI：10.1016/j.jpdc.2010.03.001.png)
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Abstract
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High-performance storage systems are evolving towards decentralized commodity clusters that can scale in capacity, processing power, and network throughput. Building such systems requires: (a) Sharing physical resources among applications; (b) Sharing data among applications; (c) Allowing customized data views. Current solutions typically satisfy the first two requirements through a cluster file-system, resulting in monolithic, hard-to-manage systems. In this paper we present a storage system that addresses all three requirements by extending the block layer below the file-system. First, we discuss how our system provides customized (virtualized) storage views within a single node. Then, we discuss how it scales in clustered setups. To achieve efficient resource and data sharing we support block-level allocation and locking as in-band mechanisms. We implement a prototype under Linux and use it to build a shared cluster file-system. Our evaluation in a 24-node cluster setup concludes that our approach offers flexibility, scalability and reduced effort to implement new functionality. (C) 2010 Elsevier Inc. All rights reserved.
Keywords:
Cluster storage
Scalable storage systems
Block-level I/O
Storage virtualization
Extensible storage stack
Shared virtual disk
Distributed file systems
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