Data allocation in Heterogeneous Disk Arrays

Document Type

Conference Proceeding

Publication Date

9-22-2011

Abstract

We consider the allocation of Virtual Arrays (VAs) with different RAID levels in a Heterogeneous Disk Array (HDA). This is expected to provide significant cost savings by consolidating multiple disk arrays into one. Disk load balancing across disk arrays is a by-product of HDA. We provide an example of potential performance benefits expected from HDA. The number of Virtual Disks (VDs) required to materialize a VA is determined by upper bounds on VD bandwidth and space per physical disk drive. Only RAID1 and RAID5 are considered in this paper, but we develop the analysis for other RAID levels. A VA allocation is successful if disks sharing VAs with a failed disk are not overloaded in degraded mode. Single-pass data allocation methods for HDA are evaluated with a synthetic stream of allocation requests. Experimental results show that allocation methods minimizing the maximum disk bandwidth and capacity utilization or their variance across all disks yield the maximum number of allocated VAs. When the disk bandwidth is the bottleneck resource we utilize clustered RAID5 arrays to increase the number of allocated VAs. © 2011 IEEE.

Identifier

80052892281 (Scopus)

ISBN

[9780769545097]

Publication Title

Proceedings 6th IEEE International Conference on Networking Architecture and Storage Nas 2011

External Full Text Location

https://doi.org/10.1109/NAS.2011.22

First Page

82

Last Page

91

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