Dynamic Reconfiguration With Public Network Interfaces

There are a few issues you must consider when completing dynamic reconfiguration (DR) operations on public network interfaces in a cluster.

• All of the requirements, procedures, and restrictions that are documented for the Solaris DR feature also apply to Sun Cluster DR support (except for the operating environment quiescence operation). Therefore, review the documentation for the Solaris DR feature before using the DR feature with Sun Cluster software. You should review in particular the issues that affect non-network IO devices during a DR detach operation.

• DR remove-board operations can succeed only when public network interfaces are not active. Before removing an active public network interface, switch the IP addresses from the adapter to be removed to another adapter in the multipathing group, using the if_mpadm(1M) command.

• If you try to remove a public network interface card without having properly disabled it as an active network interface, Sun Cluster rejects the operation and identifies the interface that would be affected by the operation.

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Caution –

For multipathing groups with two adapters, if the remaining network adapter fails while you are performing the DR remove operation on the disabled network adapter, availability is impacted. The remaining adapter has no place to fail over for the duration of the DR operation.

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Complete the following procedures in the order indicated when performing DR operations on public network interfaces.

Table 6–4 Task Map: Dynamic Reconfiguration with Public Network Interfaces

Task	For Instructions, Go To...
1. Switch the IP addresses from the adapter to be removed to another adapter in the multipathing group, using the if_mpadm.	if_mpadm(1M) man page. The appropriate Solaris documentation:  Solaris 8: IP Network Multipathing Administration Guide Solaris 9: “IP Network Multipathing Topics” in System Administration Guide: IP Services
2. Remove the adapter from the multipathing group using the ifconfig command.	The appropriate Solaris documentation:  Solaris 8: IP Network Multipathing Administration Guide Solaris 9: “IP Network Multipathing Topics” in System Administration Guide: IP Services ifconfig(1M) man page
3. Perform the DR operation on the public network interface.	Sun Enterprise 10000 DR Configuration Guide and the Sun Enterprise 10000 Dynamic Reconfiguration Reference Manual (from the Solaris 8 on Sun Hardware and Solaris 9 on Sun Hardware collections)