Eliminate cluster

[Verónica Muñoz Segovia]

I have not much experience with cluster, and we want to eliminate the cluster of two servers, because we already buy a new pair for production floor and we want those servers to others not critical applications.

Those are two K250 servers with HP-UX 10.20 running Service Guard 10.06. The cluster has only one package and are sharing a Nike controller array and a Storage Enclosure.

What are the steps I need to do in order to eliminated?

I apreciate any response.

Thanks.

Veronica.

[John Poff]

Hi Veronica,

Here is what I would try:

do Ignite-UX backups of both nodes
do backups of other data

cmhaltpkg
cmhaltcl

For each volume group in the packages [just on the box you want to run the VGs on], do:
vgchange -c y
vgchange -a y
add vg/lvol mountpoints to /etc/fstab
edit /etc/lvmrc to auto activate VGs as needed

On the node that won't be running the VGs any more, you'll probably want to vgexport the VGs.

edit /etc/rc.config.d/cmcluster to 0 so MC/SG won't get started at reboot
swremove MC/SG software



I hope this helps. It's just a brief overview of the steps. Someone else might add anything I have forgotten. You can also do a search in the forum for this and I think you'll find some other posts where this topic has come up before and the steps have been discussed.

Good luck!

JP

[John Poff]

Hi again,

I thought this topic sounded familiar. See if this thread helps:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xbfe2c6af36b7d5118ff10090279cd0f9,00.html

JP

[Sridhar Bhaskarla · Accepted solution]

Hi Veronica,

Following will be your steps.

1. Halt the package

cmhaltpkg -v your_package

2. Make the volume groups cluster unknown.
For each volume group that is part of your cluster, do the following

You can get the volume groups using the following command

grep "^VOLUME_GROUP" /etc/cmcluster/cmcl.ascii

(check the name of cluster config file)

vgchange -c n vg??
vgchange -a y vg??

3. Edit /etc/fstab and keep the file systems in it.

You can get the file systems using the command

grep "^LV" /etc/cmcluster/your_package/your_package.cntl

(check the name of your package control file)

4. Mount the file systems

mount -a

5. Start your application and make sure everything works fine.

4. Halt the cluster

cmhaltcl

5. Delete the configuration

cmdeleteconf

6. Delete the volume group configuration on the other node

Repeat this for all the volume groups that found out in step 1

vgexport vg??

7. Look at /etc/lvmrc file and if you disabled auto_vg_activate parameter. If so, enable it.

-Sri