topic Re: Adding another node in a 2node Cluster? in Operating System - HP-UX

Adding another node in a 2node Cluster?

rveri — Tue, 06 Dec 2005 13:02:05 GMT

Hi All ,

What is the correct procedure to add another node in a 2node cluster.
(MC/SG version: ServiceGuard A.11.14 Service Guard )

Thanks.

Re: Adding another node in a 2node Cluster?

Geoff Wild — Tue, 06 Dec 2005 13:08:12 GMT

You just redo your binary config with the additional node..

See section "Using MC/ServiceGuard Commands to Add Nodes to the Configuration While the Cluster is Running" in:

http://docs.hp.com/en/B3936-90053/ch07s04.html#d0e15408

Rgds...Geoff

Re: Adding another node in a 2node Cluster?

Luk Vandenbussche — Tue, 06 Dec 2005 13:34:34 GMT

Hi,

You have to bring the cluster down.
Create a new config file, without cluster lock disk.

The cmapply this file and restart the cluster.

Or see the manual for detailed info

Re: Adding another node in a 2node Cluster?

A. Clay Stephenson — Tue, 06 Dec 2005 13:38:57 GMT

It depends. If you are now running a Lock Disk then all three nodes must be able to access the lock disk or you must do away with the lock disk. If you are using a Quorum Server then it's much easier to add the node to the cluster. In any event you will have to halt the cluster and do a new cmapplyconf.

Re: Adding another node in a 2node Cluster?

Devesh Pant_1 — Tue, 06 Dec 2005 13:43:59 GMT

In order to add a node while the cluster is up and running, follow the procedure beolw:

1. Make a copy of the existing configuration
#cmgetconf -C yourfile.ascii
2.Create a new config file with all three nodes
#cmquerycl -C newconfig.ascii -c clustername -n node1 -n node2 -n node3

3. Edit this file to make changes for the nodes

4. Check for errors/typos
#cmcheckconf -C newconfig.ascii

You will have to do some additional work for the packages to be able to fail over to the preferred node and the package config file( created with cmmakepkg) will have to be edited and copied over from the running nodes to this new node.

Also before all this, make sure if you have filesystems coming over to this node in case of a failure, that the LUNs are visible and the vgimport works fine after bringing in the map file.

thanks
DP

5. Apply the changes with the following command
#cmapplyconf -C newconfig.ascii

6. Now you can start the node with the command
#cmrunnode node3
Don't forget to make changes to the /etc/rc.config.d/cmcluster file for auto cluster startup by making AUTOSTART_CMCLD=1

Re: Adding another node in a 2node Cluster?

rveri — Tue, 06 Dec 2005 14:16:08 GMT

Thanks all , and special thanks to Devesh for explaining it good.