October 22, 2011
How to Remove a Node from an HACMP Cluster
Contents
- Introduction
- STEP 1: Stop the Cluster Services on the Second Node
- STEP 2: Remove the Node from all Resource Groups
- STEP 3: Remove the Node from the Cluster
- STEP 4: Verify and Synchronize Cluster
Introduction
This article describes how to remove a node from an HACMP cluster. We find the following situation:
node01# clRGinfo
-----------------------------------------------------------------------------
Group Name Group State Node
-----------------------------------------------------------------------------
RES_GRP_01 ONLINE node01
OFFLINE node02
RES_GRP_02 ONLINE node01
OFFLINE node02
Conclusion: node02 is member of two resource groups, but all resources are active on node01.
STEP 1: Stop the Cluster Services on the Second Node
We need to release all resources from the node we want to remove from the cluster. If there are any resources active we have to move the resources to the next priority node. In this example (see above) node02 has no active resources so we can select Bring Resource Groups Offline here:
node02# smitty clstop
Stop Cluster Services
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
[Entry Fields]
* Stop now, on system restart or both now +
Stop Cluster Services on these nodes [node02] +
BROADCAST cluster shutdown? false +
* Select an Action on Resource Groups Bring Resource Groups Offline +
STEP 2: Remove the Node from all Resource Groups
node01# smitty hacmp
-> Extended Configuration
-> Extended Resource Configuration
-> HACMP Extended Resource Group Configuration
-> Change/Show a Resource Group
Change/Show a Resource Group
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
[Entry Fields]
Resource Group Name RES_GRP_01
New Resource Group Name []
Participating Nodes (Default Node Priority) [node01] + <=== remove node02 from the list ==
Startup Policy Online On Home Node Only +
Fallover Policy Fallover To Next Priority Node In The List +
Fallback Policy Never Fallback +
Remove node02 from the list of participating nodes. Repeat this step for all resource groups with node02 as partitipating node.
STEP 3: Remove the Node from the Cluster
node01# smitty hacmp
-> Extended Configuration
-> Extended Topology Configuration
-> Configure HACMP Nodes
-> Remove a Node in the HACMP Cluster
-> Select node02
Configure HACMP Nodes
Move cursor to desired item and press Enter.
Add a Node to the HACMP Cluster
Change/Show a Node in the HACMP Cluster
>Remove a Node in the HACMP Cluster<
STEP 4: Verify and Synchronize Cluster
node01# smitty hacmp
-> Extended Configuration
-> Extended Verification and Synchronization
Job done: clRGinfo now shows one node less:
node01# clRGinfo ----------------------------------------------------------------------------- Group Name Group State Node ----------------------------------------------------------------------------- RES_GRP_01 ONLINE node01 RES_GRP_02 ONLINE node01
A. Related Information
Also on 
unixwerk
- HACMP: Cluster Commandline
- How to Add a New VG to an Active HACMP Resource Group
- How to Add a New Resource Group to an Active Cluster
- How to Add a Node to an HACMP Cluster
- Setup a Two-Node Cluster with HACMP