1gb host becoming saturated when writing to 10gb host.

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Hello,

I have a situation that I am not 100% sure how to resolve.  I have a Windows host, Host A, that has a 1 gig connection to the core and is part of a Windows cluster.  I have another host, Host B,  that has a 10gig connection to the core.  Host B is essentially a NAS and a target for disk-2-disk backup. Host A is a SQL Active/Passive cluster.  The problem I have is when Host A runs its backup dumping to Host B it saturates Host A's link and causes the cluster to failover becuase SQL/Windows Clustering thinks it has lost network connectivity.  I have enabled flow control on both ports and ensured it is enabled on both interfaces or both hosts.  The only solution I can come up with is to setup some type of rate limiting.  Does anyone have any other thoughts?

Thanks in advance!
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Top Expert 2012

Commented:
Do you have any possibility to prioritze the heartbeat packets or even better: do you have the possiblity to let the heartbeat run over a separate link?
Top Expert 2014
Commented:
Is there a way you could get a second NIC in all the members of the cluster?

Then you have at least two options:

1) NIC team the NIC's in a active active setup.

2) Setup a unique VLAN/IP subnet for the heart beat.

#1 allows you to get more total outbound bandwidth if the NIC's are connected to two different switches.  If they are connected to the same switch (or a stacked switched) you could configure the switch with LACP and balance both inbound and outbound connections.

#2 gets the heart beat on its own network, but really wastes a 1 Gbps connection.

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