topic Re: Max PV bottleneck in Operating System - HP-UX

Max PV bottleneck

Shibin_2 — Wed, 05 May 2010 12:44:07 GMT

Hi all,

I have few HP-UX 11.11 servers and many application VG are facing Max PV bottleneck. When it configured, used default ( 16 ) and Curr PV is now equal to the Max PV.

Application team wants to add more disks on these VGs; but it is not possible at the moment.

Is there any way can I modify these parameter?

Re: Max PV bottleneck

R.O. — Wed, 05 May 2010 12:57:13 GMT

"Is there any way can I modify these parameter? "

AFAIK, no. But youc can create a new VG with the desired parameters and use them for the application.

Regards,

Re: Max PV bottleneck

Shibin_2 — Wed, 05 May 2010 12:59:30 GMT

But I saw some threads talking about vgmodify for HP-UX 11.11 ( unsupported ). But couldn't find any other details.

I still hope something will be there.

Re: Max PV bottleneck

Raj D. — Wed, 05 May 2010 13:06:40 GMT

Shabin,
Greetings!,
You can use vgmodify with a patch that will allow to modify the vg parameters to get more PV or PE Size. And you can get rid of max PV bottleneck.

-Standard vgmodify support onyl 11.23 and 11.31 . 11.23 needs reboot to apply the patch.

-For 11.11 you can get vgmodify from hp response center.

Check this out:
http://docs.hp.com/en/B2355-60130/vgmodify.1M.html

http://forums13.itrc.hp.com/service/forums/questionanswer.do?threadId=1154249

Hth,
Raj.

Re: Max PV bottleneck

R.O. — Wed, 05 May 2010 13:08:46 GMT

Hi,

It seems you can do it with "vgmodify" (see attach). But as you know it is not supported, so is up to you to use it. I think you may ask for it to HP support.

Regards,

Re: Max PV bottleneck

Shibin_2 — Wed, 05 May 2010 13:10:48 GMT

Thanks to both. I think I need to open a case with HPRC.

Re: Max PV bottleneck

S-M-S — Thu, 06 May 2010 06:37:11 GMT

Hi Shibin !

Increase the "maxvg" kernel oparameter to a desired value and try again

Re: Max PV bottleneck

Prasanth V Aravind — Thu, 06 May 2010 12:07:51 GMT

You have two options

1. you have to tell the apps team to use new mount points.

2. go for a vgmigration activity. create new vgs with high max-pv parameter value, copy data new lvs & then mount these old old mount points.

i have done this type of mygration in my site too... coz of same issue.

Gudluck
Prasanth

Re: Max PV bottleneck

Shibin_2 — Wed, 12 May 2010 14:59:55 GMT

Thanks to all.

We decided to execute one of the 2 options.

1. Migrate to new VG.
2. Get new bigger disk and create mirror on each LV, sync the data and remove the old LUN.