difference b/w migration we do when vms are powered off

we have cluster with 2 host under it

each host is configured with different subnet ip[vlan id] used for management network

when my vms are powered on its not allowing me to migrate vms form one host to another one,but if i power off my vm,i am able to migrate vms ?

is there any difference when we do migration for on/off vms ?

the only difference for both vm is gateway for vmkerenl port configured is different due to the management ip given for different vlan ids

is there any way out to do it for on vms ?
or we have to use same management network as well?

my concern what are the most imprtant things to be configured before we do migration for on/off vms
patronTechnical consultant Asked:
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Nagendra Pratap SinghDesktop Applications SpecialistCommented:
Is it popping any error?

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You will need to upload a screenshot of your networking. It looks like you cannot vMotion possibly, because servers cannot contact each other via the vMotion network.
Aravind SivaramanTechnical Subject Matter ExpertCommented:
Have you configured the vMotion Network?
Do you have shared storage in place?

The best practice is to have have management network in same network
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patronTechnical consultant Author Commented:
all is fine except that management network .

my concern is -we should have same management network -is that mandatory for vmotion ?

or we only have to reach @vmotion gateway only..?

it was fine when moving vms in powered off condition,but not working in powered on phase?

Please advice if there is different approach working behind vmotion/migration we do with vms in ON or OFF condition
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Network configuration of ALL your hosts should be the same.
Aravind SivaramanTechnical Subject Matter ExpertCommented:
vMotion network should be reachable on both the host.

When we migrate the VM which is Powered ON vMotion is being used to migrate the VM's

Can you share the screenshot of the error message
patronTechnical consultant Author Commented:
Thanks for all your experts advice here.

now i got the the answer fo my concern...

when we do migration/vmotion for powered on vms -it goes through vmotion port group[vmkernel]

and for powered off vms it goes through management network, which is again a vmkerenel for esxi 4.1

its applicable only for Esxi, and i found vmotion worked for my  vms after enabling vmotion and management port on same ip of mgmt network

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Great it's now working.
patronTechnical consultant Author Commented:
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