vSphere 5.5 has been now out for some time. As always with a new release, there were some major enhancements (good for us), specially on the networking and vDS.
I was impressed by Multi-NIC vMotion support when it was introduced in vSphere 5.0. With advent of 10G NIC cards and ever increasing size of worlkloads that run in single VM, it was important to leverage this technology to revamp existing vMotion.
And I must say, VMware is always two steps ahead in innovation and improving its product features.
I am today looking into the design consideration for vMotion network by using Multi-NIC vMotion and LACP support in vDS in vSphere 5.5
LACP support till vSphere 5.1 was rather limited and exclusively dependent on IP Hash load balancing. With vSphere 5.5 a lot has changed with vDS specially LACP and support for all LACP load balancing types.
LACP now support dynamic link aggregation, multiple LAGs and is not exclusively dependent on IP Hash load balancing.
Till vSphere 5.1 Multi-NIC vMotion was correct as compared to LAGs backed NICs which in turn work on LACP. LACP support till vSphere 5.1 was rather limited and exclusively dependent on IP Hash load balancing.
Now for all of you who know how IP hash load balancing works and and how vMotion selects the preferred NIC can relate to this observation.
Rest of you can dig a little and it would be very clear. Please refer to excellent article by Frank Denneman ( Here )
I am still contemplating how does this change the LACP vs Multi-NIC vMotion debate. I am trying to discuss this with my friends in VMware and lets see what are there thoughts on this.
Keep watching this space on how has this changed with new vSphere 5.5
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