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Wednesday, November 9 • 1:15pm - 2:15pm
An Analysis of Relationship between Storage Usage Distribution and Per-User Quota Value

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To prevent resource (especially storage) shortage, information systems such as storage services and email services usually impose an upper bound of resource consumption (quota) per user. In a conservative way, an administrator tends to set a quota value such as the storage capacity divided by the expected maximum number of users for safety and fairness, but it tends to leave large unused storage space, because the users’ storage usage pattern shows a long-tailed distribution.  In this paper, we analyzed storage usage distribution of some email services to approximate the distribution using a power-law distribution, and proposed a method to calculate an optimal quota value from a target size of storage consumption to increase storage utilization.  We applied an optimal quota value we calculated to a real email service and analyzed the effect of quota change. Then, we analyzed actual distributions further to find a better model to approximate the distribution, and found that a log-normal distribution explained the distribution better than power-law. We also analyzed two other universities’ email service to find similar distribution in these systems.

Session Chair
avatar for Takashi Yamanoue

Takashi Yamanoue

Professor, Fukuyama University
Takashi has been inducted into the Hall of Fame for the Association for Computing Machinery Special Interest Group of University and College Computing Services (ACM-SIGUCCS.)  and he was the chair of the SIGUCCS Tokyo Chapter in Japan and a professor at Fukuyama University. He has... Read More →


Eisuke Ito

Kyushu University
Kyushu University
avatar for Yoshiaki Kasahara

Yoshiaki Kasahara

Assistant Professor, Kyushu University
Yoshiaki Kasahara has been an Assistant Professor at Research Institute for Information Technology, Kyushu University after receiving a Doctor of Engineering degree from the same university. My research interest includes networking, server administration, and network security. Also... Read More →

Takuya Kawatani

Kyosan Electric Manufacturing Co, Ltd.
Kyosan Electric Manufacturing Co, Ltd.

Koichi Shimozono

Kagoshima University
Kagoshima University

Wednesday November 9, 2016 1:15pm - 2:15pm MST
Crystal C 1420 Stout Street, Denver, CO 80202

Attendees (7)