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https://issues.apache.org/jira/browse/CLOUDSTACK-6203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13921269#comment-13921269
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Marcus Sorensen edited comment on CLOUDSTACK-6203 at 3/5/14 7:28 PM:
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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
was (Author: mlsorensen):
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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