Abstract
Trace is usually classified as three levels: block level, file level, and object level. They share many common metrics, although each has its own unique properties. In this chapter, I will discuss block-level trace metrics in detail since the block-level trace provides more fundamental information on storage systems than other two levels. For simplicity of representation, I divide the metrics into two categories: the basic ones and the advanced ones. The meanings and performance impacts of these metrics are explained in detail.
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Notes
- 1.
This may be not true for some modern disks with new architectures, such as MBC, SMR, and Egress, where write requests may be accessed in batch.
- 2.
This calculation is for a conventional HDD. For SMR or MBC drives, it may be different.
- 3.
OLTP is from Financial1.spc and search engine from WebSearch1.spc of UMASS Trace Repository at http://traces.cs.umass.edu/index.php/Storage/Storage
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© 2018 Jun Xu
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Xu, J. (2018). Trace Characteristics. In: Block Trace Analysis and Storage System Optimization. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-3928-5_2
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DOI: https://doi.org/10.1007/978-1-4842-3928-5_2
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Publisher Name: Apress, Berkeley, CA
Print ISBN: 978-1-4842-3927-8
Online ISBN: 978-1-4842-3928-5
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