[AusNOG] VM throughput to network

[Bill Walker]

If most connections are through a router, then balancing based on IP
hash (source & destination IP) is usually the best method. You will need
to be using VMXNET3 adapters in your VM's for best performance.


Cheers, 

Bill 

On Thu, 18 Nov 2010 11:11:32 +1100, Daniel
Thoroughgood  wrote:  
I believe ESX load-balances outbound traffic
based upon destination MAC address. If traffic is mostly going to a
default gateway, or a storage device, then it's unlikely to be moved
over more than one link. 

Incoming traffic depends on the switch. 

On
Thu, Nov 18, 2010 at 10:35 AM, Peter Tonoli  wrote:

The answer is "it
depends". This doc  lists a lot of the caveats associated with
Etherchannel. 

The balancing as such also depends on the hashing
algorithm at both ends; for example, if you have few sessions (or one)
between the VM and external systems, then it's unlikely that you'll have
traffic being anywhere near balanced, and hence you won't get anywhere
near 2GB throughput. 

I think..

-------------------------
 FROM:
"Skeeve Stevens" 
TO: "ausnog" 
SENT: Thursday, 18 November, 2010
10:19:05 AM
SUBJECT: [AusNOG] VM throughput to network 

Hey all, 

Got
an interesting debate with some server guys. 

It is my 'theory' (not
backed up my technical facts) that a VM should be able to use more than
1Gig of throughput when a VM (VMware) is on a server that has a bonded
NIC to a switch which 'in Cisco talk' is doing a ether-channel/port
channel to the server - the case in point is 2 cables together, but in
theory should be able to go to 4 or more. 

The server guys are
suggesting that a single VM can only go out one of the NIC ports and
therefore only get to a maximum of 1Gb throughput. 

Is this true and is
there any docs for either HP DL 380's, VMware which would support either
stance? 

Just trying to verify a theory, and since there would be a ton
of people on this list which do VMware, NIC bonding into switching, I
thought it would be a great place to ask. 

...Skeeve 

-- 

Skeeve
Stevens, CEO 

eintellego Pty Ltd - The Networking Specialists


skeeve at eintellego.net [5] / www.eintellego.net [6] 

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383, Fax: (+612) 8572 9954 

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-- 
 Peter
Tonoli 
IT Manager
The University of Melbourne St. Vincent's Academic
Centre, St. Vincent's Institute and O'Brien Institute


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Links:
------
[1] mailto:peter at medstv.unimelb.edu.au
[2]
http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a0080094714.shtml
[3]
mailto:Skeeve at eintellego.net
[4] mailto:ausnog at ausnog.net
[5]
mailto:skeeve at eintellego.net
[6] http://www.eintellego.net
[7]
http://www.linkedin.com/in/skeeve
[8] http://facebook.com/eintellego
[9]
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[11]
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