Configuring new disks on AIX cluster Post: 302266565

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Operating Systems AIX Configuring new disks on AIX cluster Post 302266565 by dnicky on Wednesday 10th of December 2008 02:33:19 PM

12-10-2008

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Configuring new disks on AIX cluster

We run two p5 nodes running AIX 5L in a cluster mode (HACMP), both the nodes share external disk arrays. Only the primary node can access the shared disks at a given point of time.

We are in the process of adding two new disks to the disk arrays so as to make them available to the existing volume group (non rootvg) present on the shared disks. On the primary node following steps were executed to make the disks available,
1. Power down the node and disk arrays.
2. Plug in the new disks.
3. Power on the nodes and disk arrays.
4. Run cfgmgr to configure the new disks.

After the above steps, can see two new disks available on the primary node, which were then added to the existing volume group (non rootvg). A new logical volume was then created using the two new disks.

Will appreciate if anyone can confirm, if the following steps are sufficient to replicate the new disks configuration (and new logical volume configuration)on the secondary server,
1. varyoff the (non rootvg) volume group on the primary node.
2. Ensure the (non rootvg) volume group on the shared disks is varied off.
3. exportvg the volume group on secondary node
4. importvg the volume group on secondary node.

Not quite sure whether would need to delete the existing disk devices from the ODM (using rmdev) and then run cfgmgr on the secondary server before running importvg or whether running exportvg followed by importvg only is sufficient?

Last edited by dnicky; 12-10-2008 at 03:49 PM..

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cmrunnode

cmrunnode(1m)															     cmrunnode(1m)

NAME

       cmrunnode - run a node in a high availability cluster

SYNOPSIS

       cmrunnode [-v] [node_name...]  [-t | -w none]

DESCRIPTION

       cmrunnode  causes  a node to start its cluster daemon to join the existing cluster.  This command verifies the network configuration before
       causing the node to start its cluster daemon.

       To start a cluster on one of its nodes, a user must either be superuser(UID=0), or have an access policy of FULL_ADMIN allowed in the clus-
       ter configuration file. See access policy in cmquerycl(1m).

       Starting  a node will not cause any active packages to be moved to the new node.  However, if a package is DOWN, has its switching enabled,
       and is able to run on the new node, that package will automatically run there.

       If node_name is not specified, the cluster daemon will be started on the local node and will join the existing cluster.

   Options
       cmrunnode supports the following options:

	      -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.

	      node_name...
		   Start the cluster daemon on the specified node(s).

	      -w none
		   By default network probing is performed to check that the network connectivity is the same as when the cluster was  configured.
		   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

       cmrunnode returns the following value:

	       0   Successful completion.
	       1   Command failed.

EXAMPLES

       Run the cluster daemon on the current node:

	      cmrunnode

       Run the cluster daemons on node1 and node2:

	      cmrunnode node1 node2

AUTHOR

       cmrunnode was developed by HP.

SEE ALSO

       cmquerycl(1m), cmhaltcl(1m), cmhaltnode(1m), cmruncl(1m), cmviewcl(1m), cmeval(1m).

						      Requires Optional Serviceguard Software					     cmrunnode(1m)