How to Add a Node to a Resource Group

This procedure contains the following sections.

• How to Add a Node to a Scalable Resource Group

• How to Add a Node to a Failover Resource Group

You must supply the following information to complete this procedure.

• the names and node IDs of all of the cluster nodes

• the names of the resource groups to which you are adding the node

• the name of the IP Networking Multipathing group that will host the network resources that are used by the resource group on all of the nodes

Also, be sure to verify that the new node is already a cluster member.

How to Add a Node to a Scalable Resource Group

1. For each network resource that a scalable resource in the resource group uses, make the resource group where the network resource is located run on the new node.

   See Step 1 through Step 4 in the following procedure for details.

2. Add the new node to the list of nodes that can master the scalable resource group (the nodelist resource group property).

   This step overwrites the previous value of nodelist, and therefore you must include all of the nodes that can master the resource group here.

   # scrgadm -c -g resource-group -h nodelist

   -c

   Changes a resource group.

   -g resource-group

   Specifies the name of the resource group to which the node is being added.

   -h nodelist

   Specifies a comma-separated list of nodes that can master the resource group.

3. (Optional) Update the Load_balancing_weights property of the scalable resource to assign a weight to the node that you want to add to the resource group.

   Otherwise, the weight defaults to 1. See the scrgadm(1M) man page for more information.

How to Add a Node to a Failover Resource Group

1. Display the current node list and the current list of IP Networking Multipathing groups that are configured for each resource in the resource group.

   # scrgadm -pvv -g resource-group | grep -i nodelist # scrgadm -pvv -g resource-group | grep -i netiflist

   ---

   Note –

   The output of the command line for nodelist and netiflist identifies the nodes by node name. To identify node IDs, run the command scconf -pv | grep -i node_id.

   ---

2. Update netiflist for the network resources that the node addition affects.

   This step overwrites the previous value of netiflist, and therefore you must include all of the IP Networking Multipathing groups here..

   # scrgadm -c -j network-resource -x netiflist=netiflist

   -c

   Changes a network resource.

   -j network-resource

   Specifies the name of the network resource (logical hostname or shared address) that is being hosted on the netiflist entries.

   -x netiflist=netiflist

   Specifies a comma-separated list that identifies the IP Networking Multipathing groups that are on each node. Each element in netiflist must be in the form of netif@node. netif can be given as an IP Networking Multipathing group name, such as sc_ipmp0. The node can be identified by the node name or node ID, such as sc_ipmp0@1 or sc_ipmp@phys-schost-1.

3. Update the node list to include all of the nodes that can now master this resource group.

   This step overwrites the previous value of nodelist, and therefore you must include all of the nodes that can master the resource group here.

   # scrgadm -c -g resource-group -h nodelist

   -c

   Changes a resource group.

   -g resource-group

   Specifies the name of the resource group to which the node is being added.

   -h nodelist

   Specifies a comma-separated list of nodes that can master the resource group.

4. Verify the updated information.

   # scrgadm -pvv -g resource-group | grep -i nodelist # scrgadm -pvv -g resource-group | grep -i netiflist

Example – Adding a Node to a Resource Group

This example shows how to add a node (phys-schost-2) to a resource group (resource-group-1) that contains a logical hostname resource (schost-2).

# scrgadm -pvv -g resource-group-1 | grep -i nodelist
(resource-group-1) Res Group Nodelist:    phys-schost-1 phys-schost-3
# scrgadm -pvv -g resource-group-1 | grep -i netiflist
(resource-group-1:schost-2) Res property name: NetIfList
(resource-group-1:schost-2:NetIfList) Res property class: extension
(resource-group-1:schost-2:NetIfList) List of IP Networking Multipathing  
interfaces on each node
(resource-group-1:schost-2:NetIfList) Res property type: stringarray
(resource-group-1:schost-2:NetIfList) Res property value: sc_ipmp0@1 sc_ipmp0@3
 
(Only nodes 1 and 3 have been assigned IP Networking Multipathing groups. 
You must add a IP Networking Multipathing group 
for node 2.)

# scrgadm -c -j schost-2 -x netiflist=sc_ipmp0@1,sc_ipmp0@2,sc_ipmp0@3
# scrgadm -c -g resource-group-1 -h phys-schost-1,phys-schost-2,phys-schost-3
# scrgadm -pvv -g resource-group-1 | grep -i nodelist
(resource-group-1) Res Group Nodelist:     phys-schost-1 phys-schost-2 
                                           phys-schost-3
# scrgadm -pvv -g resource-group-1 | grep -i netiflist
(resource-group-1:schost-2:NetIfList) Res property value: sc_ipmp0@1 sc_ipmp0@2
                                                          sc_ipmp0@3