ClusSvc Event 1069: Cluster Resource 'Cluster IP Address' failed.



Every Sunday night, during our backups, the Cluster
detects a failure of the Public network (error ID 1069).
This causes the shared disks to fail to the passive node,
which it turn, causes the backups to fail. It usually
occurs about an hour into the backups. MS KBA 242600
describes in detail "Network Failure Detection and
Recovery in a Two-Node Cluser". I can track exactly what
happens in the Cluster.log. I don't know why the NIC on
the Active Node looses connection with the network. In
the cluster.log, I can see a record of the Node no longer
being able to ping the default gateway. However, the
passive Node can, which is why the resources fail over to
it. After about an hour, the resources fail BACK over
AGAIN! Because the same thing happens to the second
node. Now the backups quit trying, and everything is fine
until the next Sunday. Note that a Full backup runs for
16 hours on the Friday prior, having no problems at all.
Its the Sunday Incremental backup that's killing us.

We are using W2K Advanced Server, SP4, Two nodes, with a
SAN connected via Fibre HBA. The public conntection is
using 3com Gigabit 3C985b-SX. We have Veritas Volume
manager, and the Veritas Netbackup Client running.

The System Event log typically has the following errors or


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