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Internet Protocol Multimedia Subsystem (IMS) merupakan suatu arsitektur topologi framework untuk mengirimkan layanan Multimedia berbasiskan IP (Internet Protocol), yang telah menjadi arsitektur framework terkemuka yang sebagai enabler dari operator untuk menawarkan layanan VoIP dan layanan multimedia. Precopy Live Migration merupakan proses migrasi yang diterapkan pada IMS dengan cara page memory pada VM ditransmisikan pada fase iterasi ketika VM sedang dalam state running pada host sumber. Kemudian VM pada sumber di suspend menggunakan fase stop-and-copy dan sisa page memory ditransmisikan menuju host tujuan. Penelitian ini berfokus pada bagaimana IMS tetap dapat melayani pada saat terjadinya migrasi. Downtime yang terlalu lama akan berakibat pada pelayanan dari servis IMS tidak maksimal. Parameter yang akan diuji adalah Downtime, Waktu Migrasi, dan Jumlah data yang di transfer. Internet Protocol Multimedia Subsystem (IMS) is a framework architect topology to delivery multimedia services (Internet Protocol) based which has become the latest architect framework as operator services enabler that provide VoIP and Multimedia services. Precopy Live Migration implemented to IMS with VM’s memory pages are transmitted in the iteration phase, while the VM is still running at the source. After that, the VM is suspended in the stop- and-copy phase, and the remaining pages are transmitted to the destination. This research focused on how IMS can provide user during migration process. Longest downtime process will impact on service level to user. During migration process, Downtime, Migration Time, and Amount transferred data were evaluated. Keywords : downtime, migration, IMS, Virtual, precopy live migration

Precopy Live Migration on Core Network Virtualization Internet Protocol Multimedia Subsystem