MC/Service Guard

[Leoanrdo Bowens]

I have a 2 node cluseter on N-Class servers running HA MC/ServiceGuard. I have to remove a node from the cluster permanantly. The one to remove is the secondary which has no packages on it until a failover occurs. After I halt the node what are the other steps required. I assume I will have to get the primary node off of MCSG also because it will not be needed. I need instructions. Can someone help?

[Christopher McCray_1]

Hello,

You can use this doc:

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062686651

or

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062686618

These and other very useful MC/ServiceGuard docs can be found courtesy of the Technical Knowledge base using the keyword umcsg

Hope this helps

Chris

[Sridhar Bhaskarla · Accepted solution]

Hi,

I would do the following.

1. cmhaltnode

Wait until you get next maintenance window. On primary,

2. cmhaltpkg -v package_name
3. vgchange -c n vg?? for all volume groups
3. cmhaltcl
4. cmdeleteconf -f
5. vgchange -a y vg?? for all volume groups
6. mount the file systems
7. start the application

-Sri

[John Poff]

Hi,

Just to add to Sri's notes:

Edit /etc/lvmrc and set AUTO_VG_ACTIVATE=1, or add your MC/SG volume groups to the custom_vg_activation function.

Add your old MC/SG filesystem entries to /etc/fstab

Set /etc/rc.config.d/cmcluster for AUTOSTART_CMCLD=0

JP

[Martin Johnson]

You can have a single node ServiceGuard cluster, so you don't have to get the primary node off of MCSG.

One of the advantages of MCSG is that it can automatically restart a package if the application comes down.

HTH
Marty

[Leoanrdo Bowens]

Thanks for all the input. I was not able to get to the docs that Christopher McCray forwarded. I will use the responses that I received to my advantage. Chris, I would really like a copy of the docs so, if you get the opportunity send me an email with the docs at lbowens@csc.com.

[Christopher McCray_1]

Hello again,

I sent you the docs you requested. I converted them to Word docs (seemed like the easiest, best way). Anyway, Don't forget to use the keywords "umcsg" or "uxsg" and you will find a lot in the TKB about Service Guard.

Chris