Live migration

[cogarg]

Hello,

I've configured two Proxmox VE 2.0 systems, following the howtos to enable HA/drbd and fencing using ilo.

When i use live migration(from the GUI) to move a kvm guest from one node to another, there's a little(5 to 10 seconds) time period when the guest is not responding to network traffic;
-Ping stops responding for 5-10 seconds even if i set a really big ttl value and use -W 200 on the host i'm pinging from.
-If i got an open ssh connection to the guest and i'm actively typing stuff or running a simple 'top', the session is either dropped or it hangs.

I've been searching for this on the forums/wiki/site, but i haven't found anything telling me that i should or should not be losing any packets when a KVM gets moved to a different node through live migration, so...

Is the behaviour that i'm getting normal?
If not, is there a way for me to 'fix' this?

 

[holgihero]

This is normal behaviour.
Also with a HA setup you have at least a downtime when memory content and cpu state is transmitted. This might take some seconds depending mainly on ram size.
If you want seamless migration you have to take a lot more action. You would need two machines running absolutely in sync, getting same input for a while at least. This needs to be supported in the guest os also I guess.

Regards Holger

 

[spirit]

5 to 10 seconds seem to be really huge.
When I do live migration, I have some packets loss, but ping never stop to respond.
Maybe an network arp problem ? Do you have both hosts connected on the same switch ?