VMware vSphere

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  • 1.  ARP cache on virtual switch

    Posted Sep 09, 2016 11:18 AM

    We have three separate VMware SQL 2016 AlwaysOn clusters running on vShere 5.1. We noticed on all three clusters whenever we'd fail over a Availability Group to a second node within the same VLAN and running

    on the same ESX host, that the resources would not become available until a 15 minute time-out period. If we fail over the same AG group to a host in another building the resources are immediately available. 

    This only happens on the same VLAN. So we opened a ticket with Microsoft and they ran a trace and stated the arp request is being sent out but no replies are being returned. Is this a vSphere issue?

    Where in the process does VMware update the arp table?



  • 2.  RE: ARP cache on virtual switch

    Posted Sep 13, 2016 02:01 PM

    Just to be clear, you are failing a resource to a secondary node on the same ESXi host?



  • 3.  RE: ARP cache on virtual switch

    Posted Sep 13, 2016 02:39 PM

    Both VM servers just happen to be running on the same host at the moment. They will be separated later.

    I ran across this article which sounds almost the same. As a DBA I can't see the vSwitch screen.

    http://rickardnobel.se/vswitch-notify-switches-setting/