Question about HACMP for active-active mode Post: 302365740

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Operating Systems AIX Question about HACMP for active-active mode Post 302365740 by zxmaus on Wednesday 28th of October 2009 02:00:27 AM

10-28-2009

Moderator

Hi,

there is Sybase Cluster Edition that works similar to Oracle RAC.
In addition there are a lot of Vendor applications out there that have built in ha-facilities and can run / should run in a concurrent resource group - not for availability - but for load balancing reasons. And here the cluster facilities are not used for the applications themselves but for the infrastructure that points to the application. If one node goes down, the service IP just starts pointing to the other node - the application - though down on the previous node - remains available. Great solution for any kind of application that doesnt produce volatile data at all.
We have several clusters where Websphere and MQ are running active on both nodes - serving different functions - and again failover to the other node when required - serving different clients, different applications - and yes we want different instances of the same application being up on one node if the other node dies.
We have as well lots of sybase databases in a hacmp setup that have the same content but serve different purposes. Sybase replication server replicates the content of database 1 into database 2. As long as both nodes are up, database 1 is used for trading, database 2 for reporting - when one of the nodes dies, it fails over to the other node - replication remains running - and you still can use both databases for these different purposes - nothing in the listeners, pointer files or anything has to change because the IP of the application doesn't change ... and additional resources are just added via dlpar scripts if required - so nothing is starving ...
Possibilities are countless and so are the benefits of having live-live clusters Smilie

Kind regards
zxmaus

zxmaus

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LEARN ABOUT CENTOS

crm_shadow

PACEMAKER(8)						  System Administration Utilities					      PACEMAKER(8)

NAME

       Pacemaker - Part of the Pacemaker cluster resource manager

SYNOPSIS

       crm_shadow (query|command) [modifiers]

DESCRIPTION

       crm_shadow - Perform configuration changes in a sandbox before updating the live cluster.

       Sets  up an environment in which configuration tools (cibadmin, crm_resource, etc) work offline instead of against a live cluster, allowing
       changes to be previewed and tested for side-effects.

OPTIONS

       -?, --help
	      This text

       -$, --version
	      Version information

       -V, --verbose
	      Increase debug output

   Queries:
       -w, --which
	      Indicate the active shadow copy

       -p, --display
	      Display the contents of the active shadow copy

       -E, --edit
	      Edit the contents of the active shadow copy with your favorite $EDITOR

       -d, --diff
	      Display the changes in the active shadow copy

       -F, --file
	      Display the location of the active shadow copy file

   Commands:
       -c, --create=value
	      Create the named shadow copy of the active cluster configuration

       -e, --create-empty=value
	      Create the named shadow copy with an empty cluster configuration

       -C, --commit=value
	      Upload the contents of the named shadow copy to the cluster

       -D, --delete=value
	      Delete the contents of the named shadow copy

       -r, --reset=value
	      Recreate the named shadow copy from the active cluster configuration

       -s, --switch=value
	      (Advanced) Switch to the named shadow copy

   Additional Options:
       -f, --force
	      (Advanced) Force the action to be performed

       -b, --batch
	      (Advanced) Don't spawn a new shell

       -a, --all
	      (Advanced) Upload the entire CIB, including status, with --commit

EXAMPLES

       Create a blank shadow configuration:

	      # crm_shadow --create-empty myShadow

       Create a shadow configuration from the running cluster:

	      # crm_shadow --create myShadow

       Display the current shadow configuration:

	      # crm_shadow --display

       Discard the current shadow configuration (named myShadow):

	      # crm_shadow --delete myShadow

       Upload the current shadow configuration (named myShadow) to the running cluster:

	      # crm_shadow --commit myShadow

AUTHOR

       Written by Andrew Beekhof

REPORTING BUGS

       Report bugs to pacemaker@oss.clusterlabs.org

Pacemaker 1.1.10-29.el7 					     June 2014							      PACEMAKER(8)