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Full Discussion: hacmp and disaster recovery question
Operating Systems AIX hacmp and disaster recovery question Post 302346015 by bakunin on Thursday 20th of August 2009 07:56:23 PM
Old 08-20-2009
As far as i know SRDF is only a data replication facility, not a failover mechanism.

A (HA-)cluster makes *systems* highly available, specifically IP interfaces and applications. Usually data are *not* made highly available by cluster means, because data are shared between cluster nodes. Data are made highly available by mirroring, RAID-5, etc., but not by cluster means.

This means that data replication is something not in the scope of HACMP in first place and therefore not suitable for somehow substituting cluster facilities.

Having said this: how about building a "semi-automatic failover" solution in script, which does the following:

- monitor the clusters application IP to be online
- once it is not online any more:
- - roll forward the replication to the latest possible point in time, then
- - mount the (hopefully complete) data on your spare system
- - start the application on the spare system
- - initialize an unused interface with the clusters IP address
- - start serving the app via that IP interface.

There will be all kind of details to cover, which even might make this solution impossible - synchronisation problems, a procedure for taking back the app once the original cluster systems come back online, etc.. Still it is worth a try to explore if such a setup might be possible. It is kind of a "clustering for the real poor", so to say.

I hope this helps.

bakunin
 

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LEARN ABOUT HPUX

cm

cm(5)								File Formats Manual							     cm(5)

NAME

       cm - cluster monitor for high availability clusters

   Remarks
       Cluster	operations require the installation of the optional Serviceguard or Serviceguard Extension for RAC software, which is not included
       in the standard HP-UX operating system.

DESCRIPTION

       Serviceguard and Serviceguard Extension for RAC are high availability products which provide an environment such that after a failure of  a
       node,  services	(applications)	can be up and running again on another node within a very short amount of time.  In addition, Serviceguard
       Extension for RAC is the enabling software for the Real Application Clusters (RAC).  Working with the basic Serviceguard product,  Service-
       guard Extension for Faster Failover allows configuration of clusters for optimized failover.

   Commands
       The following set of commands is used to configure a high availability cluster:

		     cmquerycl(1M)
		     cmmakepkg(1M)
		     cmcheckconf(1M)
		     cmapplyconf(1M)

       The following commands are used to run or halt a cluster:

		     cmruncl(1M)
		     cmhaltcl(1M)
		     cmrunnode(1M)
		     cmhaltnode(1M)
		     cmviewcl(1M)

       Once a cluster is formed, the following commands are provided for manual operation on high availability packages:

		     cmrunpkg(1M)
		     cmhaltpkg(1M)
		     cmmodpkg(1M)

       The following commands are used within a package control script to control the services and networks configured for a package:

		     cmrunserv(1M)
		     cmhaltserv(1M)
		     cmmodnet(1M)

       A command is provided to aid in migrating from a SwitchOver/UX configuration to a Serviceguard cluster:

		     cmmigrate(1M)

       This command is not applicable with Serviceguard Extension for RAC.

SEE ALSO

       Managing Serviceguard.
       Configuring RAC Clusters with Serviceguard Extension for RAC.

						      Requires Optional Serviceguard Software						     cm(5)
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