Re: [ovirt-users] Migration Failure Due to network
> 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 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 ? ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Migration Failure Due to network
> On 20 Jul 2016, at 15:22, Alexis HAUSER> 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 ? > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
[ovirt-users] Migration Failure Due to network
Here are the two Events I can see : Host Hypervisor has network interface which exceeded the defined threshold [95%] (em1: transmit rate[98%], receive rate [4%]) Migration failed (VM: Clone-ubuntu, Source: Hypervisor, Destination: hypervisor22). Any ideas ? It it not the first time I have this kind of network saturation issue... My current temporary setup is this : 2 hosts with only one network physical interface used and assigned to ovirtmgmt, used by all VM. Do migration of a running VM from one host to the other use the network assigned to that VM for migration ? Or does it use ovirtmgmt in all cases ? What minimum network architecture setup would you advice me to avoid this kind of issues ? ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users