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Terminology for cluster networks

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Hello!

I've already asked the question on cluster communication network here
http://social.technet.microsoft.com/Forums/windowsserver/en-US/2f650bfb-3544-4290-84e0-7138159e4cf2/cluster-heartbeat?forum=winserverfiles 

"Q2: Do all of these three types of cluster communication (including heartbeat) occur via the cluster network configured as in the preceeding screenshot (10.1.1.0) or, for example,Network Health  monitoring (including heartbeats) uses one network whileIntra-Cluster communication uses some other?"

and got the answer, but now I'd like to clearify one more thing: if all types of cluster communication (heartbeat + InterClusterCommunication+CSV) occur via the single network (it's often called "Heartbeat" network) why do some admins designate two different networks for both Heartbeat and CSV traffic simultaneously:

http://andreagx.blogspot.ru/2011/12/hyper-v-cluster-network-configuration.html

...while others do NOT designate separate network for the Heartbeat:

http://social.technet.microsoft.com/Forums/windowsserver/en-US/078950b0-b9e8-44a9-9f90-71a67df92cad/nic-assignments-for-2012-hyperv-cluster?forum=winserverClustering

"NIC 1 Management LAN
NIC 2 Cluster Shared Volume
NIC 3 Live Migration
NIC 4 iSCSI /MPIO
NIC 5 iSCSI /MPIO
NIC 6 Virtual Switch - Teamed
NIC 7 Virtual Switch - Teamed
NIC 8 Virtual Switch - Teamed"

So either the terms "Heartbeat network/nic" and "CSV network/nic" are used interchangeably or I don't understand whatCSV network means...

Thank you in advance,

Michael


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