Re: [ovirt-users] Migration Failure Due to network
On 20 Jul 2016, at 15:22, Alexis HAUSER
<alexis.hauser(a)telecom-bretagne.eu> wrote:
> Use "Clusters" -> "Logical Networks" -> "Manage
Networks" for assigning
> network for migrations. It's ovirtmgmt by default. Note that migration
> network has to have IPs on hosts.
Nice, do you think I should dedicate a link only for migration, for safety ?
> Hosts have VDSM configuration option - [vars]/migration_max_bandwidth
> in /etc/vdsm/vdsm.conf. It's 52MB/s by default. So it looks like your
> network is already highly used.
It's not highly used, it's yet on a 10/100 Mb switch...But it's just
temporary. Anyway it's interesting because it simulates a highly use network, which
can happen.
> Your VM migration fails because migration is so slow so it just can't
> migrate without downtime. You can adjust "Use custom migration
> downtime" VM option to make any VM migrated over any network. Please
> note it's a maximal value. Actually it starts with a value 10 times
> lower and increases it automatically. 5000 is good value to start in
> your case.
Thanks, but it doesn't seem to change anything : I added
max_outgoing_migrations = 1
migration_max_bandwidth = 5
well this is not going to make it any faster, quite the opposite:)
You need to play with the downtime setting (in UI or in vdsm.conf) to affect convergence
in your constrained connectivity setup
There’s a lot more intelligence in oVirt 4.0 regarding this, so if it’s an option I would
recommend to upgrade and change the migration policy to one of the new ones
Thanks,
michal
in /etc/vdsm/vdsm.conf
on my concerned host, but it still goes to 98% use of network and migration fail...I
restart vdsmd.service but it doesn't seem to change anything. Any idea ?
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