03-11-2013
Quote:
Originally Posted by
DGPickett
So, is the HACMP as a whole never down, just degraded to fewer nodes?
Yes. Exactly this is the point.
Quote:
Originally Posted by
DGPickett
It seems like with a HA cluster, you can update hosts in rotation and return them to the pool, so it is only down on host at a time.
Yes and no. The point is that the HA-communication is done via RSCT and the versions of the RSCT packages have to be consistent throughout the cluster at any time. This is why you have to split up the cluster into single nodes at one point (precisely the point where you update the RSCT). During this phase communication would not be possible. But as each node is single at this time it doesn't recognize this inability to communicate.
I hope this helps.
bakunin
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LEARN ABOUT DEBIAN
kanif.conf
KANIF.CONF(5) kanif.conf configuration file for kanif KANIF.CONF(5)
NAME
kanif.conf - configuration file for kanif
SYNOPSIS
$HOME/.kanif.conf, /etc/kanif.conf or /etc/c3.conf
DESCRIPTION
kanif.conf is the configuration file for kanif. It is optional and only helps the management of static clusters (configurations that do not
change much over time). It mimics the syntax of C3 configuration file.
It is composed of a sequence of one or more cluster definitions. Each cluster definition is made of the word "cluster" followed by the
cluster name and, enclosed in a pair of curly braces :
o the front node specification. This is either:
o a simple hostname which can be reached from the inside of the cluster (compute nodes).
o two names separated by a colon. The first name is the name used from the outside to log on the front node (not used by kanif). The
second is the name used from the cluster compute nodes to reach the front node.
o an hostname with a colon prepended. This is used for indirect clusters. These are not supported by kanif at this time.
o zero or more compute nodes specifications:
o a simple hostname (anything that is not of the following form)
o an host set made of a prefix, a range and a suffix.
o an exclude directive that must follow an host set or another exclude directive. This is made of the word "exclude" followed on the
same line by either a single number or an interval between brackets. This applies to the range of the preceding host set. If the
exclusion is an interval, the separator between the word "exclude" and this exclusion is optional.
o a dead node. The word "dead" followed by the name of the dead node on the same line.
Notice that all nodes excluded (using exclude directives or dead nodes) will not take part of the deployment, but are still taken into
account in cluster ranges when giving machines specifications to kanif (they are kind of placeholders). This is the interest of specifying
nodes as dead or excluded rather than dropping them from the definitions.
EXAMPLE
cluster megacluster { # The # character introduce comments
megacluster-dev
megacluster0[1-9]
megacluster[10-64]
}
cluster supercluster {
super-ext:super-int
exclude # The host "exclude"
super[01-99]
exclude 02 # "super02" is excluded
exclude[90-95] # "super90" to "super95" are excluded
dead # The host "dead"
dead othernode # "othernode" is dead
}
SEE ALSO
kanif(1), taktuk(1)
AUTHOR
The author of kanif and current maintainer of the package is Guillaume Huard. Acknowledgements to Lucas Nussbaum for the idea of the name
"kanif".
COPYRIGHT
kanif is provided under the terms of the GNU General Public License version 2 or later.
perl v5.14.2 2012-06-22 KANIF.CONF(5)