Activity Based Sector Synchronisation: Efficient Transfer of Disk-State for WAN Live Migration

Author

Akoush, Sherif ; Sohan, Ripduman ; Roman, Bogdan ; Rice, Andrew ; Hopper, Andy

Author_Institution

Comput. Lab., Univ. of Cambridge, Cambridge, UK

fYear

2011

fDate

25-27 July 2011

Firstpage

22

Lastpage

31

Abstract

Live migration of virtual machines is now commonplace but the issue of synchronising storage remains an obstacle to wide-area migration between datacentres. We discuss the range of possible designs for synchronising disk images and argue that we have to be adaptive at the sector level to efficiently transfer disk-state to the destination. We show, using a number of production workloads, that delaying the transmission of "hot"sectors can achieve considerable bandwidth reduction over a naive eager strategy. We introduce the Activity Based Sector Synchronisation (ABSS) algorithm and show by trace-driven simulations that ABSS is able to deliver a useful trade-off with a data transmission overhead between 0.3% and 2.4% of a gigabit link whilst incurring in the majority of cases a migration latency of less than 1.1 s.

Keywords

disc storage; virtual machines; virtual storage; wide area networks; ABSS algorithm; WAN live migration; activity based sector synchronisation; bandwidth reduction; disk image; disk image synchronisation; disk-state; trace-driven simulation; virtual machine; wide-area migration; Algorithm design and analysis; Bandwidth; Clustering algorithms; Heuristic algorithms; Prediction algorithms; Production; Synchronization;

fLanguage

English

Publisher

ieee

Conference_Titel

Modeling, Analysis & Simulation of Computer and Telecommunication Systems (MASCOTS), 2011 IEEE 19th International Symposium on

Conference_Location

Singapore

ISSN

1526-7539

Print_ISBN

978-1-4577-0468-0

Type

conf

DOI

10.1109/MASCOTS.2011.20

Filename

6005365