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From "Andrija Panic (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-6203) KVM live migration improvement
Date Fri, 14 Jul 2017 15:33:00 GMT


Andrija Panic commented on CLOUDSTACK-6203:

Hi Marcus,

perhaps it's silly question, but inside I dont see the "vm.migrate.autoconverge"
 line at all. (
Is this implemented and in what ACS version please ?


> KVM live migration improvement
> ------------------------------
>                 Key: CLOUDSTACK-6203
>                 URL:
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: KVM
>            Reporter: Marcus Sorensen
>            Assignee: Marcus Sorensen
>             Fix For: 4.4.0
> Run the KVM live migration in a thread so we can monitor it. This will allow us to see
how long migrations are taking and do things like pause the vm if migration is stalling (per
user defined time limit) to quickly complete migration, or set the domain's max downtime during
cut-over between machines (higher values make migration of busy vms easier, lower values may
make migration stall).  In the future we can add the autoconvergence flag that stalls VMs
for a few ticks to allow memory copy to catch up, but it will be awhile before libvirt that's
shipped in a distro supports it, so these tunables may be useful now.

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