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05-07-2010 06:49 AM
05-07-2010 06:49 AM
Question in regards to VC Active and\or passive configuration
There was a recent discussion over the benefits of "Active/Active" NIC teaming and "Active/Passive" configuration.
Eirik commented:
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Me and my collegues have been looking at the configuration of active – active and active – passive configurations of the VC-modules.
In the VC – cookbook the example is basically two drawings of the same cake, using different icing.
What is the real pros\cons of using one over the other, and why should a customer implement one or the other ?
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Cullen pitched in:
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This is personal opinion only, so take it for what it’s worth.
“Active-Passive” provides you with the same total upstream bandwidth in both a normal and failure mode. You get the benefit of redundancy outside the enclosure without doing NIC teaming on the servers; however servers will lose some connections if one of the Virtual Connect modules is down. With NIC teaming you can lose a Virtual Connect module without losing connections assuming you configure teams properly.
“Active-Active” provides you with the most available bandwidth in normal operation but only 50% of that in a failure mode. You must use NIC teaming to take advantage of this level of redundancy – if all uplinks from one Virtual Connect module are down, you lose all connections to that network. This is closer to how you’d operate with non-bladed servers.
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What do you think? Let us know what you do.