Tohru Kondo

A Mobility Management System for the Global Live Migration of Virtual Machine across Multiple Sites

With rapid spread of virtualization technologies, Live migration which provides the ability to migrate a running virtual machine (VM) among physical hosts without interruption. Especially, Global Live Migration (GLM) which enables to migrate VM across the geographically-distributed Wide Area Networks (WANs) is an essential step towards development of the inter-cloud environment. However, GLM gets a bit complicated for network configuration compared with ordinary live migration. We have already proposed the GLM method which implements IP mobility support architecture with multiple interfaces to enable live migration among distributed sites consisting of different IP network segments. However, there is no sufficient consideration about the management of smooth handoff for the VM migration on the Internet. In this paper, we propose a mobility management system for GLM, and integrate into our developed nation-wide virtualization infrastructure. The proposed system enables VMs seamless handoff without any modification of the hypervisor while keeping network configuration of the migrating site. Performance evaluation shows the processing overhead of the proposed management system with GLM among multiple sites which are more than 600 km distant. As a result, we confirm that the proposed system provides smooth handoff for the VM on the widely-distributed environment if the proposed system is implemented.

Design and Evaluation of Global Live Migration with Mobility Support for IP Multicast

Virtualization technologies are widely used, and include Live Migration which moves running virtual machines between different physical hypervisors for dynamic load-balancing. In addition, Global Live Migration with IP mobility is also proposed. It enables migration among distributed sites and provides continuation even if the network of the virtual machines was changed. However, it supports only IP unicast communication, not IP multicast communication. In this paper, we propose a mobility support mechanism for IP multicast on virtual machines, and evaluate its basic performance using prototype system. As a result, the proposed method can provide migration function continuously receiving multicast stream stopped same as ordinary Live Migration.

A Design and Evaluation of a Geolocation-Aware Reliable Multicast System on Wireless Networks

An IP multicasting can provides an efficient method to distribute contents to multiple destinations, and it can be used on a wireless environment with a deployment of an IP network. Since the IP multicasting on wireless network based on CSMA/CA protocol does not support RTS/CTS procedure, it may cause bursty packet losses due to collisions. In this paper, at first, we discuss these issues from experimental results on an IEEE 802.11g wireless LAN. Based on this, we propose a geolocation-aware reliable IP multicast system to improve packet loss. A proposed system can work effectively to prevent the ACK/NACK-implosion by providing a selective loss recovery policy depending on clients geolocation. This will enable limited clients to provide effective performance of loss recovery while suppressing ACK/NACK packets from the other clients. So a proposed method will have a beneficial effect on wireless environments. We show its effectiveness from some experimental evaluations.

A Design and Development of a Multi-source Streaming Platform Based on a Building Block Architecture

A new rich video streaming service which handles multi-angle videos and personalized videos based on users preference is expected to bring novel viewing experiences to users. It provides a viewing environment with reality by creating a screen while selecting preferred streams for user itself. However, it is necessary to construct a streaming platform which handles multiple streams, and to prepare a user-friendly viewer interface. To resolve these issues, in this paper, we design a multi-source available streaming platform which is constructed by application gateways with the building block approach. This approach brings the extensibility of stream processing. Moreover, we introduce about development for some functions of a application gateway and a viewer interface, and discuss the effectiveness of this platform.

An MPEG2 over IP transfer system integrating live distance lecture and on-demand distance learning

In the institutions of higher education, hundreds of intellectual activities, i.e. lectures, are performed everyday. It is very important for such institutions to have a system which can archive these activities as their property efficiently and systematically. However it will not always be the good materials for on-demand distance learning if we record the usual lectures. On the other hand, the live distance lecture has been performed. Although some revisions are required, the archives of live distance lecture is well suited for the materials of on-demand distance learning by nature. In this paper we describe the MPEG2 over IP transfer system which is the key technology to integrate the live distance lecture and on-demand distance learning. And then we describe the live distance lecture archive system operated in Hiroshima University.

Development of the Edge Computing Platform Based on Functional Modulation Architecture

In this paper, we propose an edge computing platform that can coordinate with each computing resources of device, edge node and cloud for diversifying data can be modularized and actively deployed in cooperation within the wide area network. This platform brings transparent processing environment for IoT devices according to a data characteristic or use purpose. We have been developing the platform based on open-source software for container and its automating deployment, scaling, and management tool.

A Design and Evaluation of User-space IP Mobility Implementation

An architecture for IP layer mobility such as MIPv6 requires modification in the protocol stack of mobile terminals for seamless handoff across different IP networks. MAT (Mobility support Architecture and Technologies) which has been developed by the authors, also requires the similar modification. The modification of the protocol stack of the terminals has the difficulty for wide spread of IP mobility function using the seamless handoff. In order to solve this problem, we propose a user-space implementation of MAT in this paper. Also, we show some evaluations on overhead caused by user-space implementation and discuss them from the view point of practical use.

A Design and Implementation of Global Distributed POSIX File System on the Top of Multiple Independent Cloud Services

We propose an extension of distcloud-fs for achieving a global distributed POSIX file system in intercloud environment. The file system works in intercloud environment, that is, on the top of multiple independent cloud services. The important capability of the intercloud extension is that there is no need for users to take care of infrastructure layer, while the file system stores data into multiple cloud services, transparently and automatically. As the result, cloud users may have diversity about vendors and locations for data platform, as discussed in various intercloud research projects. In this paper, we describe the architecture of the distcloud-fs and its intercloud extension. We also describe design and implementation of the prototype and discuss some typical use cases of the file system with practical demonstrations.

An implementation and evaluation of a selective QoS-aware mobile multicasting on multiple wireless networks

With rapid spread of wireless networks, the Internet users require stable and adaptive communication environment everywhere. IP multicasting can provide an efficient method to distribute contents to multiple destinations, and it can be used on a wireless environment with a deployment of IP networks. In the case of broadband wireless networks, a mobile video streaming service are one of attractive services. However, since IP multicast on wireless network does not support retransmission procedures on the MAC layer, any QoS mechanism is required in upper layers. On the other hand, most mobile devices are able to equip multiple wireless interfaces to connect available network dynamically. In this study, therefore, we propose selective QoS-aware multicast streaming which is combined hybrid communication (IP multicast and IP unicast) and ARQ procedure using multiple interfaces. The proposed mechanism provides sustainable streaming while selecting an user-oriented QoS method dynamically on heterogeneous environment. We design and implement its prototype system, and integrate it with a realtime streaming application. Simulation analysis shows the effectiveness and scalability of a proposed method, and some transmission experiments by the prototype system demonstrate improvement of application QoS.

Supporting USB Devices for the Global Migration

Virtualization has been also used as desktop utility and supports VM migration, which is a function to migrate a VM (Virtual Machine) from a physical host to another. However, it cannot migrate hardware configuration of peripherals. We focus on USB devices as peripherals and provide the USB device connection method by combination of MAT and USB/IP for the global migration. In our system, MAT is implemented into VM and solves mismatch of VMs IP address caused by VM migration. We define VM migration capable of migrating among distinct hosts over different network segments as the global migration. USB device connectivity between host and VM is ensured by USB/IP. Combination of MAT and USB/IP allows a migrated VM to connect a USB device attaching to any hosts after migration. This paper describes the proposed mechanism for the global migration supporting USB devices.