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Managing Serviceguard 13th Edition, February 2007

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Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5202
Ensuring Consistency of Kernel Configuration
Make sure that the kernel configurations of all cluster nodes are
consistent with the expected behavior of the cluster during failover. In
particular, if you change any kernel parameters on one cluster node, they
may also need to be changed on other cluster nodes that can run the
same packages.
Enabling the Network Time Protocol
It is strongly recommended that you enable network time protocol (NTP)
services on each node in the cluster. The use of NTP, which runs as a
daemon process on each system, ensures that the system time on all
nodes is consistent, resulting in consistent timestamps in log files and
consistent behavior of message services. This ensures that applications
running in the cluster are correctly synchronized. The NTP services
daemon, xntpd, should be running on all nodes before you begin cluster
configuration. The NTP configuration file is /etc/ntp.conf.
For information about configuring NTP services, refer to the HP-UX
manual HP-UX Internet Services Administrator’s Guide posted at
http://docs.hp.com -> Networking and Communication -> Internet
Services.
Tuning Network and Kernel Parameters
Serviceguard and its extension products such as SGeSAP, SGeRAC, and
SGeFF, have been tested with default values of the supported network
and kernel parameters in the ndd and kmtune utilities.
Adjust these parameters with care.
If you experience problems, return the parameters to their default
values. When contacting HP support for any issues regarding
Serviceguard and networking, please be sure to share all information
about any parameters that were changed from the defaults.
Third-party applications that are running in a Serviceguard
environment may require tuning of network and kernel parameters:
• ndd is the network tuning utility. For more information, see the man
page for ndd(1M)
• kmtune is the system tuning utility. For more information, see the
man page for kmtune(1M).