dCache: from Resilience to Quality of Service
Albert L. Rossi, Krishnaveni Chitrapu, V. Garonne, Dmitry Litvintsev, Svenja Meyer, Paul Millar, Tigran Mkrtchyan, Lea Morschel, Marina Sahakyan · EPJ Web of Conferences · 2021
A major goal of future dCache development will be to allow users to define file Quality of Service (QoS) in a more flexible way than currently available. This will mean implementing what might be called a QoS rule engine responsible for registering and managing time-bound QoS transitions for files or storage units. In anticipation of this extension to existing dCache capabilities, the Resilience service, which maintains on-disk replica state, needs to undergo both structural modification and generalization. This paper describes ongoing work to transform Resilience into the new architecture which will eventually support a more broadly defined file QoS.