MC ServiceGuard questions

[Gord Moore]

Pardon me if this sounds too simple, but I have been through the database and haven't found a
clear answer to these questions.

1) I am updating the volume groups on the Adoptive
node. When doing the vgexport on the source, does
the package have to be halted? I see lots of times
when the package is halted on the source and
started on the Adoptive node for testing, once the
copy of the vg map file is done, but can I
set up the volume groups without enduring the
package shutdown/startup?

2) Does the package control file have to be copied
at the same time? If I have created logical volumes
on the source, do I have to manually enter lines in
the control file? If so, that would explain why the
file has to be copied as well, but the documents
don't seem to state that specifically.

I have read UXSGLVKBAN00000008 and
UXSGLVKBAN00000012 ; are there any other
relevant documents

[James R. Ferguson · Accepted solution]

Hi:

As the documents indicate, a great deal of the work can be done while the cluster is running. In fact, some of the steps require a running cluster.

I would certainly want to edit the package control scripts, push them to each node, and do a 'cmapplyconf'. Afterall, you want to be able to activate the new volume group and logical volumes and you want all nodes to reflect this consistently.

The documents you cited are ones I remember reading. Other MC/ServiceGuard documentation is easiy found by specifying "uxsg*" as a keyword to the Technical Knowledge Base search engine.

Regards!

...JRF...

[Roger Baptiste]

1) I am updating the volume groups on the Adoptive
node. When doing the vgexport on the source, does
the package have to be halted?

>> No. Not necessary. use the
vgexport -p -v -s options. This will
get the vgmaps without disturbing the vg.


I see lots of times
when the package is halted on the source and
started on the Adoptive node for testing, once the copy of the vg map file is done, but can I set up the volume groups without enduring the package shutdown/startup?

>> you can set up the vg structure on the standby nodes without bring the package down.
Ofcourse, if you want to test whether the package works on adoptive node, then you would obviously need to shutdown the pkg on the primary and try bringing it up on standby node.
It can be done anytime as per your schedule and convenience.


2) Does the package control file have to be copied at the same time?

>> yes. The control file should be the same
on all nodes of the cluster.

If I have created logical volumes
on the source, do I have to manually enter lines in the control file?

>> Yes again. And whenever you change the control file on the primary node. Copy the file over to the standby nodes too.


HTH
raj