HP Serviceguard manual Using Easy Deployment, Adding a Node to a cDSF Group

“Specifying a Lock LUN” (page 189), and “Creating the Storage Infrastructure and file systems with LVM, VxVM and CVM” (page 177).

Adding a Node to a cDSF Group

When you add a new node to a cluster that uses cDSFs, you also need to add the node to the cDSF group. For example, to add the new cluster node node5 to the existing cDSF group, run the following command from one of the existing members of the group:

cmsetdsfgroup –a –n node5

Removing a Node from a cDSF Group

When you remove a node from a cluster that uses cDSFs, you should also remove the node from the cDSF group. For example, to remove node3 from the existing cDSF group, run the following command from one of the existing members of the group:

cmsetdsfgroup –r –n node3

Displaying the cDSF Configuration

•To see the members of a cDSF group, log in on one of the members and run cmsetdsfgroup -q

•To display all the information about the configuration stored in the configuration file /etc/ cmcluster/cdsf/cdsf_config, log in on one of the cDSF group members and run cmsetdsfgroup -v-q

CAUTION: Do not modify cdsf_config.

•To report information (in line output format only) about DSFs, cDSFs, and volume groups for one or more nodes, use cmquerystg (1m).

•You can also use the HP-UX command io_cdsf_config (1m) to display information about cDSFs.

See the manpages for more information.

Migrating Existing LVM Cluster Storage to cDSFs

You can migrate existing LVM cluster storage to cDSFs using the HP-UX command vgcdsf (1m). See the manpage for more information. See also “LVM Commands and cDSFs” (page 105).

IMPORTANT: If you change the cluster lock volume or volumes to cDSFs, you need to change the cluster lock information in the cluster configuration file and re-apply the configuration; follow one of the procedures under “Updating the Cluster Lock Configuration” (page 295).

Using Easy Deployment

Easy Deployment commands enable you to get a cluster up and running in the minimum amount of time. Instructions follow. For an overview, see “About Easy Deployment” (page 105).

Before You Start

IMPORTANT: Before you start, you should have done the planning and preparation outlined in Chapter 4 (page 92). You must also do the following.

•Install Serviceguard on each node that is to be configured into the cluster; see “Installing and Updating Serviceguard ” (page 158).

You must have superuser capability on each node.

•Make sure all the nodes have access to at least one fully configured network.

Preparing Your Systems 161