Managing Serviceguard Eighteenth Edition, September 2010

Default is 2,000,000 microseconds (2 seconds).
This means that the network manager will poll
each network interface every 2 seconds, to make
sure it can still send and receive information.
The minimum value is 1,000,000 (1 second) and
the maximum value supported is 30 seconds.
IMPORTANT: HP strongly recommends using
the default. Changing this value can affect how
quickly the link-level and IP-level monitors detect
a network failure. See “Monitoring LAN
Interfaces and Detecting Failure: Link Level”
(page 92), “Monitoring LAN Interfaces and
Detecting Failure: IP Level” (page 98), and
“Reporting Link-Level and IP-Level Failures”
(page 101).
Can be changed while the cluster is running.
CONFIGURED_IO_TIMEOUT_EXTENSION The number of microseconds by which to
increase the time Serviceguard waits after
detecting a node failure, so as to ensure that all
pending I/O on the failed node has ceased.
This parameter must be set in the following cases.
• For extended-distance clusters using
software mirroring across data centers over
links between iFCP switches; it must be set
to the switches' maximum R_A_TOV value.
NOTE:
CONFIGURED_IO_TIMEOUT_EXTENSION
is supported only with iFCP switches that
allow you to get their R_A_TOV value.
• For switches and routers connecting an NFS
server and cluster-node clients that can run
packages using the NFS-mounted file
system; see “Planning for NFS-mounted File
Systems” (page 174).
To set the value for the
CONFIGURED_IO_TIMEOUT_EXTENSION,
you must first determine the Maximum
Bridge Transit Delay (MBTD) for each
162 Planning and Documenting an HA Cluster