12-07-2011
To minimize the danger of split brain usually more than one channel for heartbeat is used. The HA-clusters I worked with used 3: user-lan, a seperate cluster-lan and disks. With this configuration I never encountered a split brain situation.
Why would you want to change the ip-addresses during a failover? A simple solution for this would be not to make the ip-addresses cluster resources but configure them locally.
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LEARN ABOUT CENTOS
dshbak
DSHBAK(1) General Commands Manual DSHBAK(1)
NAME
dshbak - format output from pdsh command
SYNOPSIS
dshbak [OPTION]..
DESCRIPTION
The dshbak program formats pdsh pdsh output for humans. Output from each node is consolidated, the leading "node:" is stripped, and a
header block with the node name is added. If the -c option is specified, nodes with identical output are not displayed twice; instead, the
header will contain a list of nodes. The list of nodes is further compressed into node ranges if the node names have a numeric suffix.
OPTIONS
-h Display a summary of command line options.
-c Do not display identical output from nodes twice. Instead, print the list of nodes with matching output in the header block.
-d DIR Write consolidated node output to separate files in output directory DIR. Any existing files will be overwritten.
-f With -d, force creation of specified DIR.
ORIGIN
A rewrite of IBM dshbak(1) by Jim Garlick
<garlick@llnl.gov> on LLNL's ASCI Blue-Pacific IBM SP system.
SEE ALSO
pdsh(1)
http://pdsh.googlecode.com
2011-02-26 DSHBAK(1)