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The EOS deployment at CERN is a core service used for both scientific data processing, analysis and as back-end for general end-user storage (eg home directories/CERNBOX). The collected disk failure metrics over a period of 1 year from a deployment size of some 70k disks allows a first systematic analysis of the behaviour of different hard disk types for the large CERN usecases. In this contribution we describe the data collection and analysis, summarise the measured rates and compare them with other large disk deployments. We further describe initial steps to use the collected failure and SMART metrics to develop a machine learning model predicting imminent failures and hence avoid service degradation and repair costs.

Disk failures in the EOS setup at CERN