Re: [ovirt-users] Failed migration - Migration is stuck
On 21 Apr 2016, at 13:31, Ollie Armstrong <ollie(a)fubra.com>
wrote:
I'm having some issues with a couple of VMs in my cluster that cannot
be live migrated between hosts. It appears to be the issue that is
referenced by https://access.redhat.com/solutions/870113 and
https://access.redhat.com/solutions/1159723.
I currently have a dedicated 1Gbps network for migrations and have
modified some of my vdsm settings so that my vdsm.conf looks like
this:
[vars]
ssl = true
migration_timeout = 600
migration_max_bandwidth = 100
max_outgoing_migrations = 3
you should lower this, otherwise it won’t fit (1 migration at 100MBps would eat your whole
link already). So use 1
migration_downtime = 1000
it’s not really 1000. There’s a UI for that in Edit VM, so you shouldn’t set it here at
all
and if you do, the algorithm behind it is not-so-great in <=3.6.5.
Use migration_downtime_steps=3 or 5 or something lower to mitigate that wrong algorithm
behavior
if you need to overcome a longer peak period of activity, also change
migration_progress_timeout to something more than 150s
Thanks,
michal
[addresses]
management_port = 54321
The issue was happening before the configuration changes too.
The relevant lines from my vdsm.log from the host that the VM is being
migrated from: http://ix.io/xeT
Has anyone been able to resolve this or come up with a workaround for
this problem? I understand that it is because the migration cannot
occur as fast as the changes in the VM are happening so this could be
difficult to get working. Some downtime is acceptable for these VMs,
so if there are further config changes that can be made which allow
for more downtime then I would consider that a solution.
Ollie
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