Available online at www.ispacs.com/acte Advanced Computational Techniques in Electromagnetics Volume 2012, Year 2012, Article ID acte-00120, 6 Pages doi: 10.5899/2012/acte-00120 Research Article ADVANCED COMPUTATIONAL TECHNIQUES IN ELECTROMAGNETICS EMI-Specific Performance Integrity of OS Migration (Teleportation) Over a Wireless Channel Such as WLAN Yusuke Kimura 1 , Masahiko Sano 1 , Perambur S. Neelakanta 2,∗ 1 Graduate School of Advanced Technology and Science, College of Systems Innovation Engineering, Department of Information Science and Intelligent Systems, The University of Tokushima, Tokushima 770-8506, Japan 2 Department of Computer and Electrical Engineering & Computer Science, College of Engineering & Computer Science, Florida Atlantic University, Boca Raton, Florida 33431, USA Copyright c  2012 Yusuke Kimura, Masahiko Sano, and Perambur S. Neelakanta. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT The performance aspects of OS migration implemented in a wireless LAN (WLAN) environment is investigated taking into account of underlying physical-layer based constraints due to EMI/RFI implications in the indoor operations. Specifically, the interfering effects of coexisting IEEE 802.11 devices on OS migration are analyzed via spectrum spill-over effects and host-to-interferer separation. Basic models are presented thereof and computed results are furnished and discussed. While generic studies, for example, on wireless coexistence between IEEE 802.11 and IEEE 802.15.4 devices prevail, no such efforts per se exist on the topic of WLAN supporting OS migration vis-` a-vis associated EMI/RFI related impairments in the teleportation. As such, this study can be regarded as a novel attempt. Keywords: EMI/RFI; OS migration; Teleportation; WLAN. 1. Introduction I n the context of modern data-center applications and in clus- tered computer ambient, use of migration (teleportation) of operating systems (OS) facilitated across distinct physical hosts is considered as an attractive option. It provides separation be- tween hardware and software, ease of fault-management, load- balancing and low-level system maintenance requirements [1]. OS migration (or teleportation) broadly refers to what is known as virtual machine (VM) migration. It involves running a virtual machine and moves (teleports) the computational fea- tures from one physical machine to another. Such teleportation, however, remains transparent to the guest OS as well as remote clients of the VM. For all participant clients, the VM appears as if it has not changed its location. The only change perceived could be the system slowing down during the migration. VM moving to a machine also implies possible better perfor- mance as a result of envisaging more available resources. The platform of VM (with its hardware and software layers) is illus- trated in Fig. 1. ∗ Corresponding author E-mail addresses: kimura@is.tokushima-u.ac.jp (Y. Kimura), sano@is.tokushima-u.ac.jp (M. Sano), neelakan@fau.edu (P.S. Neelakanta) Guest OS Guest OS Virtual hardware interface VM kernal Physical hardware Figure 1: VM platform layers. 2. OS migration in traditional wireline environ- ment: an overview In implementing VM between physical servers, traditionally wireline strategies are followed. That is, the teleportation at physical-layer level is done in LAN/WAN environment via tra- ditional Ethernet connectivity through cables (copper and/or fiber) that support the necessary bandwidth (BW) such as 622 Mbps. A compelling reason for server virtualization is the underly- ing ability to move VMs between physical servers. The real advantage of such virtualization is that, it enables production VM to be transferred directly to a physical server, (either to a server within the same data center or to a server in a different data center without any service interruption). In such opera-