Managing Serviceguard 12th Edition, March 2006

Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5204
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).
Serviceguard has also been tested with non-default values for these two
network parameters:
• ip6_nd_dad_solicit_count - This network parameter enables the
Duplicate Address Detection feature for IPv6 address. For more
information, see “IPv6 Relocatable Address and Duplicate Address
Detection Feature” on page 476 of this manual.
• tcp_keepalive_interval - This network parameter controls the length
of time the node will allow an unused network socket to exist before
reclaiming its resources so they can be reused.
Serviceguard supports the tcp_keepalive_interval being changed in
the following configurations:
— Supported with Serviceguard A.11.14 or later.
— Supported on nodes running HP-UX 11.11 only.
The following requirements must also be met:
— The maximum value for tcp_keepalive_interval is 7200000 (2
hours, the HP-UX default value).
— The minimum value for tcp_keepalive_interval is 60000 (60
seconds).
—The tcp_keepalive_interval value must be set on a node
before Serviceguard is started on that node. This can be done by
configuring the new tcp_keepalive_interval in the
/etc/rc.config.d/nddconf file, which will automatically set
any ndd parameters at system boot time.
—The tcp_keepalive_interval value must be the same for all
nodes in the cluster.
For more information, see “Tunable Kernel Parameters” and “Transport
Administrator’s Guide” posted at http://docs.hp.com. Click “By
Release” then choose your operating system.