Disabling Network Interface Card (NIC) in Windows device manager does not fail over the cluster service group in Storage Foundation for Windows HA / Veritas Cluster Service (VCS)

Problem

Disabling Network Interface Card (NIC) in Windows device manager does not fail over the cluster service group in Storage Foundation for Windows HA / Veritas Cluster Service (VCS)

Solution

When NIC is disabled in device manager to try and mimic a NIC failure in VCS, you see the following symptoms.
- IP resource will change to an Unknown state with a question mark and will not fault.
- NIC resource will change to an Unknown state with a question mark and will not fault.

Cause:
The process of disabling a NIC in Windows 2000/2003 removes the NIC from the "NIC table" of the system. VCS reads from this table and the NIC goes into an Unknown State because the NIC is no longer in the table. That is, VCS treats a disabled NIC as if it is no longer in the system.
This condition is the same behavior as when an incorrect MAC address for a NIC resource is entered in the attributes for the NIC resource.

Details:
Disabling the NIC from the device manager is not a valid test for the NIC agent. The NIC and IP resource will remain in an Unknown State and will not failover. Due to this reason, testing the NIC by disabling will not provide the accurate reproduction of a failure.

Note:
During NIC failure however, the NIC will be still in the NIC table of the OS and hence VCS acts accordingly and will fault the resource.

Terms of use for this information are found in Legal Notices.

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