NLB members : mix of VM & physical servers

Posted on 2013-06-06
Last Modified: 2013-06-09
Understand that to create an MS NLB cluster which have all VMs as
its members, it has to be a multicast NLB plus static ARP entries
to be defined in all switches & uplink switch ports.

We currently have 3 physical Crystal report servers (all of which
also act as print servers) : suppose we P2V'ed only one of them,
can we shut down the P2V'ed physical server & then make this
VM a member of the NLB cluster.  This NLB cluster is an existing
NLB previously with the 3 physical servers in it.

Any special settings needed like setting the NLB to multicast or
special settings on the LAN switches?
Question by:sunhux
  • 3
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Author Comment

ID: 39226666
What if I have 2 VMs & 1 physical server?  Can they still be members
of an NLB cluster & do we need to set the NLB as multicast with
static ArP entries set in the switches?
LVL 119

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 490 total points
ID: 39226754
That is correct, I think we've discussed this before at length.

Cluster MUST be set to Multicast, and you then must assign the Cluster IP Address, against the MAC address, and statically configure the ports for your HOsts and  Physical server nic ports.

Author Comment

ID: 39229734
Even if in the NLB cluster there's only one VM and the other
being the physical server?

If we have 2 VMs, we've indeed discussed that it needs to be
in multicast with static arp entries defined in the switches
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LVL 119

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 490 total points
ID: 39229794
Yes, we have mixtures of physical and virtual NLB clusters.

All static arps need to be configured, it's not different for virtual or physical machines.

Author Comment

ID: 39231394
Just 1 last question:

suppose the VM joins the NLB (which has 2 other servers but
they're physical servers, not VMs) successfully & we don't
vMotion the VM to another ESXi host, would it give any
issue (as long as I don't do vMotion) ?
LVL 119

Accepted Solution

Andrew Hancock (VMware vExpert / EE MVE^2) earned 490 total points
ID: 39231436
It would not cause any issues, but if the port changes that the cluster MAC IP Addresses appears on, and it's not statically allocated, the Cluster is not likely to converge.

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