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IBM System Storage DR550 Version 3.0 ------17 March 2006 Page 85
IBM Storage Systems Copyright © 2006 by International Business Machines Corporation
HACMP Network Considerations
If you are using the dual node configuration, HACMP has been installed and implemented. Should
a failure occur in the network, or within the server, HACMP will shift the work to the second server.
There are requirements for specific access to the customer network that need to be considered.
HACMP Configuration in Switched Networks
Unexpected network interface failure events can occur in HACMP configurations using switched
networks, if the networks and the Ethernet switches are incorrectly defined or configured. Follow
these guidelines when configuring switched networks:
• VLANs. If VLANs are used, all interfaces known to HACMP on a given network must be on
the same VLAN.
• Autonegotiation settings. Some Ethernet NICs are capable of autonegotiating their speed
and other characteristics, such as half or full duplex. In general, if the NIC supports it, the NIC
should be configured not to use autonegotiate, but to run at the desired speed and duplex value.
The switch port to which the NIC is connected should be set to the same fixed speed and duplex
value.