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Operating Systems AIX AIX Hardware Migration w/ HACMP...Advice Needed Post 302971778 by bakunin on Monday 25th of April 2016 02:29:38 PM
Old 04-25-2016
Quote:
Originally Posted by uzair_rock
I thought about that, but here is the issue;

Both networks have restrictions. I cannot put old IP (172.X) on the new hardware as it connect to the new network and vice versa, that is what makes it so complicated.
In this case you will have to have a downtime of some sorts. Alas, there seems to be no way around that because you need to (newly) configure HACMP on your new system and this means some downtime when you make the transition. Fortunately this downtime can be minimised pretty much by good planning.

Furthermore you haven't said anything about involved OS and HACMP versions. I suppose you will have to update at least one of them (most probably both) too.

I'd investigate the following procedure (you might have to add some things, this is just a first idea):

- Take an mksyb from the running systems, create the appropriate LPARs on the new system and try to install it from the mksysb image without any data (just the rootvg).

- Now do all the updates (start with OS, then the HACMP software) on the new systems

- get a single LUN from your SAN and configure your new cluster with the same topology as the old one, just with one test-VG on the single LUN. Use this to test your zoning, (basic) cluster setup and other details.

- Finally, after preparing your new cluster with new addresses on the new hardware you need the downtime: get the SAN people to zone the old data-LUNs to your new hardware so that the disks are seen from your cluster nodes, create the new cluster config for the imported VGs and start. You might want to add the DNS names of the old cluster service IPs as aliases to the new addresses so that the transition becomes smoother for the clients.

I hope this helps.

bakunin
 

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cmruncl(1m)															       cmruncl(1m)

NAME
cmruncl - run a high availability cluster SYNOPSIS
cmruncl [-f] [-v] [-n node_name...] [-t | -w none] DESCRIPTION
cmruncl causes all nodes in a configured cluster or all nodes specified to start their cluster daemons and form a new cluster. To start a cluster, a user must either be superuser(UID=0), or have an access policy of FULL_ADMIN allowed in the cluster configuration file. See access policy in cmquerycl(1m). This command should only be run when the cluster is not active on any of the configured nodes. This command verifies the network configu- ration before causing the nodes to start their cluster daemons. If a cluster is already running on a subset of the nodes, the cmrunnode command should be used to start the remaining nodes and force them to join the existing cluster. If node_name is not specified, the cluster daemons will be started on all the nodes in the cluster. All nodes in the cluster must be available for the cluster to start unless a subset of nodes is specified. Options cmruncl supports the following options: -f Force cluster startup without warning message and continuation prompt that are printed with the -n option. -v Verbose output will be displayed. -t Test only. Provide an assessment of the package placement without affecting the current state of the nodes or packages. The -w option is not required with the -t option as -t does not validate network connectivity, but assumes that all the nodes can meet any external dependencies such as EMS resources, package subnets, and storage. -n node_name... Start the cluster daemon on the specified subset of node(s). -w none By default network probing is performed to check that the network connectivity is the same as when the cluster was config- ured. Any anomalies are reported before the cluster daemons are started. The -w none option disables this probing. The option should only be used if this network configuration is known to be correct from a recent check. RETURN VALUE cmruncl returns the following value: 0 Successful completion. 1 Command failed. EXAMPLES
Run the cluster daemon: cmruncl Run the cluster daemons on node1 and node2: cmruncl -n node1 -n node2 AUTHOR
cmruncl was developed by HP. SEE ALSO
cmquerycl(1m), cmhaltcl(1m), cmhaltnode(1m), cmrunnode(1m), cmviewcl(1m), cmeval(1m). Requires Optional Serviceguard Software cmruncl(1m)
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