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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
Old 10-28-2009
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
 

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trigger(8)						      System Manager's Manual							trigger(8)

Name
       trigger - trigger a target node to request a down-line load

Syntax
       /etc/trigger node [ options ]

Description
       The command triggers the bootstrap mechanism of a target node, causing the target to request a down-line load.  Once a target node is trig-
       gered, it loads itself in whatever manner its primary loader is programmed to operate.  The target node could request a down-line load from
       the host that just triggered it or from another adjacent node, or the target node could load itself from its own mass storage device.

       The  node argument is the name or address of the target node.  A node name consists of from one to six alphanumeric characters.	For single
       networks, a node address consists of a decimal integer (1-1023).  For multiple networks, a node address consist	of  two  decimal  integers
       (n.n), where the first indicates the network number (1-63), and the second indicates the node address (1-1023).

       The  command requires the identification of the service circuit over which the load is performed, the Ethernet hardware address of the tar-
       get node, and the service password needed to gain access to the target.	This information is included in the nodes database entry  for  the
       target node.  A node entry is defined with the command.	For further information, see Alternatively, you can choose not to include a target
       node's service password in the nodes database for security reasons.  You must therefore specify this value in the command line by using the
       -p option.

Options
       -p     Uses the specified service and password (next arguments) in accessing the target node.

Examples
       This command triggers node Bangor to issue a down-line load request:
       # /etc/trigger bangor <RET>

See Also
       mop_mom(8), addnode(8), load(8), remnode(8), getnode(8), ccr(8)
       Guide to Local Area Transport Servers

																	trigger(8)
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