期刊名称：Lecture Notes in Engineering and Computer Science
印刷版ISSN：2078-0958
电子版ISSN：2078-0966
出版年度：2018
卷号：2233&2234
页码：237-242
出版社：Newswood and International Association of Engineers
摘要：We developed a configuration to place a cash
storage called Cloud on-Ramp (CoR) with small capacity
between client terminals at remote offices and a cloud storage
connected by a wide area network. A CoR is placed in each
remote office, and applications access them via a local area
network, guaranteeing access performance. A CoR synchronizes
the data with the cloud storage by copying updated data from
the client terminal at regular intervals. It is necessary that a
window to carry out the bulk-copy function be shortened and
repeated many times to keep the latest data in the cloud storage.
A method of maintaining consistency of data at a CoR is
necessary, even if the data are updated in the copy by the client
terminal. Therefore, we propose the "intermittent snapshot
method", with which a snapshot is taken during bulk-copy
execution and released as soon as the bulk copy is over. We
evaluated the proposed method from the perspective of an
implementation design. We formalized the method by using a
stochastic Petri-net model and considered the proper size of the
bulk-copy window that optimizes both the synchronization delay
and application-access performance through simulation.
