Nov 4 – 8, 2019
Adelaide Convention Centre
Australia/Adelaide timezone

Making cheap disks cheap with dCache storage events and QoS

Nov 7, 2019, 3:30 PM
Hall F (Adelaide Convention Centre)

Hall F

Adelaide Convention Centre

Poster Track 4 – Data Organisation, Management and Access Posters


Tigran Mkrtchyan (DESY)


Within the DOMA working group, the QoS activity is looking at how best to describe innovative technologies and deployments. Once scenario that has emerged is providing storage that uses end-of-warranty disks: the cheap (almost free) nature of this storage is offset by a much larger likelihood of data loss. In some situations, this trade-off is acceptable, provided the operational overhead of handling this data loss is not excessive.

In this paper, we present a model where dCache provides access to this data. Improvements within dCache administrative interface allow for almost no operational overhead for handling such storage. The storage events concept allows experiment data-management frameworks, such as Rucio, to learn of any data-loss in a robust and fully automated fashion. These frameworks can then follow strategies to recover from these problems; for example, by copying the lost data back into dCache.

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