topic Re: vgreduce and vgextend question in Operating System - HP-UX

vgreduce and vgextend question

CJENSEN_1 — Sun, 14 Dec 2008 18:32:29 GMT

Hi All,
This is on HPUX 11.11, RP5470 server.
Very basic question here. In order to do some load balancing, I am doing the vgreduce and vgextend on a volume group. This is on a volume group that runs oracle financials. Question: does the database and all application processing have to be stopped in order to do this? Or, can vgreduce and vgextend be issued when the application and database is running?

Re: vgreduce and vgextend question

Patrick Wallek — Sun, 14 Dec 2008 18:40:34 GMT

You can do this while the app and DB are running.

It should not hurt anything.

Re: vgreduce and vgextend question

CJENSEN_1 — Sun, 14 Dec 2008 18:51:02 GMT

So unix just takes care of things, even if, say, it was in the middle of a write operation?

Re: vgreduce and vgextend question

James R. Ferguson — Sun, 14 Dec 2008 19:37:04 GMT

Hi:

> So unix just takes care of things, even if, say, it was in the middle of a write operation?

Yes, you are quite safe performing the swap of the primary and secondary pvlinks.

Regards!

...JRF...

Re: vgreduce and vgextend question

Jeeshan — Mon, 15 Dec 2008 04:36:18 GMT

yeah, the Olympians are right.

its always recommended to take backup both OS and database when you reduce or extend the the file system. otherwise if somethin goes wrong you may not get back your valuable data.

>>does the database and all application processing have to be stopped in order to do this?

yeah certainly

>>can vgreduce and vgextend be issued when the application and database is running?

vgextend doesn't need any downtime. but vgreduce is very very sensitive.

you may did this using OnlineJFS. it'll not need any downtime if you have proper backup.