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https://issues.apache.org/jira/browse/CLOUDSTACK-6203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcus Sorensen resolved CLOUDSTACK-6203.
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Resolution: Fixed
added agent.properties tunables. The commit is based on 4.2 code we've been
running in production for awhile.
# set target downtime at end of livemigration, the 'hiccup' for final copy.
Higher numbers
# make livemigration easier, lower numbers may cause migration to never
complete. Less than 1
# means hypervisor default (20ms).
#vm.migrate.downtime=0
# Busy VMs may never finish migrating, depending on environment. When its
available, we will
# want to add support for autoconvergence migration flag which should fix this.
Set an upper
# limit in seconds for how long live migration should wait, at which point VM
is paused and
# migration will finish quickly. Less than 1 means disabled.
#vm.migrate.pauseafter=0
> KVM live migration improvement
> ------------------------------
>
> Key: CLOUDSTACK-6203
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-6203
> 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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