A Session State Migration Architecture for Flexible Server Consolidation

Takeshi USUI  Kiyohide NAKAUCHI  Yozo SHOJI  Yoshinori KITATSUJI  Hidetoshi YOKOTA  Nozomu NISHINAGA  

IEICE TRANSACTIONS on Communications   Vol.E96-B   No.7   pp.1727-1741
Publication Date: 2013/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.1727
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Internet Architectures, Protocols, and Management Methods that Enable Sustainable Development)
session state migration,  server consolidation,  network operation,  server and client application,  

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This paper proposes a session state migration architecture for flexible server consolidation. One of technical challenges is how to split a session state from a connection and bind the session state to another connection in any servers. A conventional server and client application assumes that a session state is statically bound to a connection once the connection has been established. The proposed architecture reduces the migration latency, compared to an existing study by splitting the session state from the connection. This paper classifies common procedures of session state migration for various services. The session state migration architecture enables service providers to conduct server maintenance at their own convenience, and to conserve energy consumption at servers by consolidating them. A simulation to evaluate server consolidation reveals that the session state migration reduces the number of servers for accommdating users, compared to virtual machine migration. This paper also shows implementation of the session state migration architecture. Experimental results reveal that the impact caused by the proposed architecture on real-time applications is small.