Adaptive Load Balancing in Disk Arrays
||Adaptive Load Balancing in Disk Arrays
||P. Scheuermann, G. Weikum, P. Zabback
||Proc. of the 4th Int. Conf. on Foundations of Data Organization and Algorithms (FODO'93)Chicago
||Institute of Information Systems, ETH Zurich
Large arrays of small disks are providing an attractive approach
for high performance I/O systems. In order to make effective use
of disk arrays and other multi-disk architectures, it is necessary
to develop intelligent software tools that allow automatic tuning
of the disk arrays to varying workloads. In this paper we describe
an adaptive method for data allocation changing access frequencies
of files by reallocating file extents, thus "cooling down" hot
disks. In addition, the method takes into account the fact that
some files may exhibit periodical access patterns, and considers
explicitly the cost of performing the "cooling" operations.
Preliminary performance studies based on real-life I/O traces
demonstrate the effectivity of this approach.
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