Dual nic card for a VM

A developer is asking for dual nic card for a VM. Is there any advantages of assigning dual nic card for a vm ?
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sara2000Asked:
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yo_beeDirector of Information TechnologyCommented:
Other than the ability to communicate with two different subnet.  They are running at 10 Gb so I am not sure if you really are going to get any more throughput.  

What's the developers reason?
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sara2000Author Commented:
As per developer, it is for performance. If I understood correctly, If we have an Esxi with 10GbE then the VM is using what the ESxi host has , in this case the 10GbE for VM, am I correct?
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yo_beeDirector of Information TechnologyCommented:
The limiting factor from what I can see is the host to the outside network (storage and clients).   I am not an expert in VM like others here so I maybe completely wrong.  I would leave this question open until Andrew Hancock or someone else chimes in.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
A developer is asking for dual nic card for a VM. Is there any advantages of assigning dual nic card for a vm ?

Unless he wants specific access to Hardware related NIC functions in the network interface you are going to provision him!

be-aware of the limitiations - PCI Passthrough or VMware Direct Path I/O has on a VM!

Theoretically it could be faster!

I would as the question ? WHY?
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sara2000Author Commented:
He thinks using two nic card will give better performance.
How this is possible?  end of the day both nic has to go through  same port group?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
technically it depends on how that two nic card is configured.... both internally in the VM and physical switch!

so hypothetically - yes - it could be boned, e.g. 2 x 10GBe = 20GBe uplink

but then depending upon your current host configuration that could have up links configured as trunks, but is he really going to try and exceed 10GBe, because as has already been stated, the nics might be physical, but the environment is virtual e.g. processor and disk access.
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sara2000Author Commented:
Thanks Andrew,
If I understood correctly, If the ESXI host is configured as trunk with10GbE then no VM will not go beyond 10GB , am i correct?
Then one nic will be enough to reach 10gBE?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Correct
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sara2000Author Commented:
I have a VM. This VM is on an ESXI host which uses 10GbE physical nic.
The windows network status shows it as 1Gbps. Is it it supposed to show as 10Gbps?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
depends on the nic in the VM.

I guess you not applying Best Practice, and are using E1000 interface which is a no no! E1000 is a really an emulated nic, and not virtual aware!

Switch it to the VMXNET3  (fully virtual) and make sure you have VMware Tools installed and then it will report 10GBe!
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sara2000Author Commented:
Thanks Andrew.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
np
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