Question about HACMP for active-active mode Post: 302365516

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Operating Systems AIX Question about HACMP for active-active mode Post 302365516 by shockneck on Tuesday 27th of October 2009 09:38:38 AM

10-27-2009

Registered User

HACMP terminology changed now and then. Some terms were used with older HACMP versions 3 and 4, some came into existence with the current HACMP Version 5 while others ceased to exist. The same is true with certain functions/possibilities. IBM Speak itself can be a bit challenging but when you mix up words from different times you end up in a mess.

An active-active cluster has (at least) two nodes and two Resource Groups RG. So there is one RG per node and only during takeover/failover two RG are on one node. This is a very good setup because during normal operation the RG (its application) has its dedicated CPU/RAM/IO. Furthermore not everybody can afford running (i.e. paying for) two servers but using only one. It does not at all mean that there is no takeover / failover possible.

A concurrent HACMP RG means Oracle RAC. I am not aware of another application that is able to run as a concurrent HACMP cluster. While there are two or more nodes active at a time this is not usually called an active-active configuration as no takeover is involved. In a concurrent cluster a node may die but the other(s) keep on working regardless.

Cascading / rotating is related to RG behaviour. If there is a fixed order of how the RG is taken over from node to node (usually in a Cluster with 3+ nodes that are different so that using certain nodes is perferable) this is a cascading behaviour. If the RG does not care on what node it is active, i.e. it can be active on any node a rotation of the RG might be OK.

Concurrent volume group are rarely used these days. Today you are likely to use Enhanced Concurrent Mode VG. And Oracle RAC can use an ECM VG in a Concurrent Cluster.

As you might have guessed by now already: some reading might be required. If you are an absolute beginner with HACMP you might start by reading the HACMP cookbook from December 2005 followed by the PowerHA cookbook (yes, the name changed with 5.5 ....) from September 09.

shockneck

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LEARN ABOUT DEBIAN

getlist

GETLIST(1)						      General Commands Manual							GETLIST(1)

NAME

       getlist - get a list from an NNTP server

SYNOPSIS

       getlist [ -h host ] [ list [ pattern [ types ] ] ]

DESCRIPTION

       The getlist program obtains a list from an NNTP server and sends it to standard output.

       The  list  may  be  one	of  active,  active.times,  distributions,  or	newsgroups.   These  values  request  the active(5), active.times,
       /etc/news/distributions, or /var/lib/news/newsgroups files, respectively.

OPTIONS

       -h     If the ``-h'' flag is used, then the program connects to the server on the specified host.  The default is to connect to the  server
	      specified in the inn.conf(5) file.

       If  the list parameter is active, then the pattern and types parameters may be used to limit the output.  When pattern is used, only active
       lines with groups that match according to wildmat(3) are printed.  When types is also given, only active lines that  have  a  fourth  field
       starting with a character found in types are printed.

       For example, the following command will obtain the one-line descriptions of all newsgroups found on UUNET:
	      getlist -h news.uu.net newsgroups

       The following line lists all groups where local postings are permitted, are moderated or aliased:
	      getlist active '*' ym=

       Note that the listing files other than the active file is a common extension to the NNTP protocol and may not be available on all servers.

HISTORY

       Written by Landon Curt Noll <chongo@toad.com> for InterNetNews.

SEE ALSO

       active(5), nnrpd(8), wildmat(3).

																	GETLIST(1)