Hi

Despite being directly connected with a crossover cable and each server
being connected in to the switch, they seem to think that they need to
failover when the switch goes off line. Why?

Surely they should only be checking connectivity if the heartbeat fails over
the direct connection. Then, they attempt to use the LAN connection.

Have I missed something here?

Thanks

David

The Physical port is dependent on the switch port.
The IP address is dependent on the Physical port
The Network Name is dependent on the IP address (Cluster Manager)
The Service is dependent on the Network Name (Cluster Manager).

The switch goes offline and starts a cascade of failure. This is exactly
what is expected.

--
Geoff N. Hiten
Senior SQL Infrastructure Consultant
Microsoft SQL Server MVP


"David Morgan" <microsoft_newsgroups (AT) NOdavidmorgan (DOT) SPAMme.uk> wrote in
message news:u6$pDoXIIHA.6068 (AT) TK2MSFTNGP05 (DOT) phx.gbl...

Consider this. The cluster has to be able to determine if it is servicing
the public. It doesn't do that through the crossover. Rather, it has to
try to communicate via the public (non-heartbeat) NIC(s). If the switch
goes offline, that tells the node that owns the IP that it can't communicate
with the outside world. Hence, the failover.

Conversely, if you cut the crossover cable, there should not be a failover,
since the cluster can communicate via the public NIC(s), if so configured.

--
Tom

----------------------------------------------------
Thomas A. Moreau, BSc, PhD, MCSE, MCDBA, MCITP, MCTS
SQL Server MVP
Toronto, ON Canada
https://mvp.support.microsoft.com/profile/Tom.Moreau


"David Morgan" <microsoft_newsgroups (AT) NOdavidmorgan (DOT) SPAMme.uk> wrote in
message news:u6$pDoXIIHA.6068 (AT) TK2MSFTNGP05 (DOT) phx.gbl...
Hi

Despite being directly connected with a crossover cable and each server
being connected in to the switch, they seem to think that they need to
failover when the switch goes off line. Why?

Surely they should only be checking connectivity if the heartbeat fails over
the direct connection. Then, they attempt to use the LAN connection.

Have I missed something here?

Thanks

David