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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
Kind regards
zxmaus
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
Kind regards
zxmaus
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LEARN ABOUT HPUX
sgmgr
sgmgr(1M) sgmgr(1M) NAME
sgmgr - Serviceguard Manager SYNOPSIS
filename ] | COMserver username password cluster_name ...]] COMserver2 Remarks Serviceguard Manager is the graphical user interface for Serviceguard or Serviceguard Extension for RAC software, Version A.11.12 or later, Serviceguard products are not included in the standard HP-UX operating system. DESCRIPTION
The command starts Serviceguard Manager, the graphical user interface for Serviceguard clusters. Serviceguard Manager can be installed on HP-UX, Linux, or Windows. Serviceguard Manager can be used to view saved data files of a single cluster, or to see running clusters. To see the "live" cluster map, Serviceguard Manager connects to a Serviceguard node on the same subnet as those clusters, specifically to a part of Serviceguard called the Cluster Object Manager (COM). Options supports the options listed below. No options are required. If any option is not specified, the user will be prompted to supply it after the interface opens. Open a previously saved or example object data file. The file will have the .sgm extension. It can display only one cluster. This option cannot be used with any other options. Specify the Serviceguard node that will be the server. This node's COM will query cluster objects running on its subnets, and will report their status and configuration. Servers with Serviceguard Version A.11.12 or later can monitor clusters. Servers with Ser- viceguard Version A.11.14 or later can also perform administrative actions. Servers with Version A.11.16 or later can also configure clusters. To specify multiple sessions, repeat the -s option. The user login name for the COMserver node. Valid only if COMserver is specified. The user password on the COMserver node. Valid only if username is specified. In creating the map, the COMserver will include the cluster where it is a member. In creating the map, the COMserver will report information about the specified cluster_name(s). Specify clusters with the following cluster software installed: MC/Serviceguard Version A.10.10 or later, MC/LockManager Version A.11.02 or later, Serviceguard OPS or Extension for RAC Version A.11.08 or later, and all versions of MetroClusters and ContinentalClusters. To see several clusters, repeat the -c option. If you specify this unused nodes option all COMservers will report information about nodes that have Serviceguard installed, but are not currently configured in any cluster. To connect to another COMserver for another session, repeat the -s options. AUTHOR
was developed by HP. SEE ALSO
See documents at http://docs.hp.com/hpux/ha including: Managing Serviceguard. Configuring OPS Clusters with Serviceguard OPS Edition. Using Serviceguard Extension for Real Application Cluster (RAC). Series 700 or 800 Works with Optional Serviceguard or Serviceguard Extension for RAC Software sgmgr(1M)