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Bagging Estimation of Availability in Public Cloud Storage

The availability of cloud storage is a key performance parameter. Though its measurement is included in any cloud monitoring system, the statistical accuracy of such measurements is often neglected. Such measurements may therefore be useless in SLA-related disputed between cloud providers and customers. In this paper Bootstrap Averaging (Bagging) is employed to assess the statistical accuracy when we measure the availability and the number of outages over a single period of time. The distribution and the confidence intervals are reported for a set of major cloud providers, using datasets built from customer reports. By using proper confidence intervals, the compliance of cloud providers with respect to target availability and outage figures can be checked.