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[Qemu-devel] Qemu-kvm live migration modify

From: Gilar Dwitresna
Subject: [Qemu-devel] Qemu-kvm live migration modify
Date: Wed, 13 Apr 2016 14:43:36 +0700

I have done make implementation of qemu-kvm instalation for live migration on ubuntu with sharing storage (NFS) configuration.
the qemu-kvm has been succeed for live migration with default algorithm (guest without service), but if the guest run the service (streaming server), the dirty pages rate are increase from 900 to 7000 pages, and live migration can't succeed.

i have played run live migration with extended downtime 30 second, live migration can be succees, consequenly the downtime come to increase.
My system use fast ethernet 100mbps for network bandwidth, 2 PC with ram 8 GB for host, 1 PC RAM 4GB HDD 500 GB for NFS shared storage. Guest VM configure with 2GB RAM HDD 100 GB, migrate from host A to host B.

From some reference, if the write rate to the memory pages in use by the VM (here after referred to as the dirty page rate) is high compared with the cost of transferring the pages between the two hosts involved in the process, (as dictated, among others, by the network bandwidth,) then live migration may not be possible.

In the case with the high dirty pages, i run the live migration while the guest run the streaming server with network bandwidth 100 mbps, then the server can be migrated.

can i modify qemu-kvm live migration algorithm? and what should i do to modify this algorithm that can be migrate while the VM Guest run the servive (streaming server) without extended downtime?

Regards, Papandayan

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