Ramifications to enabling vMotion under the Management Network Properties?

Hello,

I am wanting to enable vMotion on all of our hosts, but am wondering if there are any ramifications to doing so?  There must be, otherwise it would have been enabled by default or rather there wouldn't even be the need for the context of enabling/disabling...IE it would just be a capability.

So I am wondering if flipping the switch on for this would knock out the network connectivity on the host for a brief period, require a host restart, cause latency...require some sort of special configuration...etc?

Thanks a lot.
CnicNVAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I am wanting to enable vMotion on all of our hosts, but am wondering if there are any ramifications to doing so?  There must be, otherwise it would have been enabled by default or rather there wouldn't even be the need for the context of enabling/disabling...IE it would just be a capability.

it's not enabled by default, for the following reasons.....

So I am wondering if flipping the switch on for this would knock out the network connectivity on the host for a brief period, require a host restart, cause latency...require some sort of special configuration...etc?

It's a flag which is enabled/set, so the hypervisor, sends and receives the vMotion Traffic through the specified  VMKernel Portgroup.

BUT, you may want to have a a think about best practices...

1. dedicated vSwitch
2. dedicated physical network interfaces
3. dedicated vMotion network
4. resilience, and at least two physical network interfaces
5. resilience, and at least two vmkernel portgroups
6. Jumbo Frames

Most VMware Admins, just tick the box! without any thought to creating any of the above....

vMotion Traffic, (transfer of VM information) needs to happen very quick in real time, with no disruption, otherwise the vMotion will fail, and it's recommended, that this traffic is isolated from all other traffic VM Data, VM LAN, Management Network, ISCSI or NFS Storage traffic...
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CnicNVAuthor Commented:
Ok thanks a lot.  I thought as much.  As we do not have shared storage, or separate VLANs configured for vMotion, I will avoid doing this for the time being until I have the time/hardware resources to implement such a change.

This information is good:-)
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