topic Re: How to increase MAX PV in a vg in Operating System - HP-UX

How to increase MAX PV in a vg

Carme Torca — Fri, 16 Nov 2007 05:04:32 GMT

Hi,

How can I increase de MAX PV in a vg, now I have one vg witch MAX PV = 16 and I would like to put 40.

Could anyone help me?
Thanks,
Carmen.

Re: How to increase MAX PV in a vg

Shrikant Lavhate — Fri, 16 Nov 2007 05:06:56 GMT

You need to edit kernal parameters for the same.

Re: How to increase MAX PV in a vg

Luk Vandenbussche — Fri, 16 Nov 2007 05:08:28 GMT

This can only be done when you create the volumegroup

vgcreate -p

See also man vgcreate

Re: How to increase MAX PV in a vg

Shrikant Lavhate — Fri, 16 Nov 2007 05:08:40 GMT

Kernal tuning info , you can get it on HP like this is for HPUX 11i

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01920025/c01920025.pdf (BSC link updated by admin)

Re: How to increase MAX PV in a vg

Robert-Jan Goossens — Fri, 16 Nov 2007 05:13:31 GMT

Hi Carmen,

There is a tool called vgmodify available for 11iv2(PHCO_35524) and 11iv3.

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01920387/c01920387.pdf (BSC link updated by admin)

Regards,
Robert-Jan

Re: How to increase MAX PV in a vg

Roberto Volsa — Fri, 16 Nov 2007 07:46:57 GMT

no wya to change MAX PV on an already created VG.

You need to create another vg and move data in the new one.

RV

Re: How to increase MAX PV in a vg

Amit Parui — Fri, 16 Nov 2007 07:57:11 GMT

hi Carme,

In this case you can do two things -

1) To create a new vg, setting the max pv to the max -

vgcreate -p 255 ...

2) To take a backup of the data and then vgexport the current vg. Then create a vg with the same vg with the required settings and eventually do a vgimport. This should work. But remember do take a backup of ur vg before.

Re: How to increase MAX PV in a vg

Sp4admin — Fri, 16 Nov 2007 09:18:37 GMT

I agree with everybody else.

you would need tp do this when you created the volumegroup. The only other way is to create another vg and move the data.

sp,

Re: How to increase MAX PV in a vg

Torsten. — Fri, 16 Nov 2007 10:36:43 GMT

See the example, this works on 11.23 and 11.31 (I changed the PV value from 4 to 6)
(VG must be de-activated):

#vgmodify -p 6 vgtest

Current Volume Group settings:
Max LV 255
Max PV 16
Max PE per PV 8683
PE Size (Mbytes) 4
VGRA Size (Kbytes) 1152
The current and new Volume Group parameters differ.
An update to the Volume Group IS required

New Volume Group settings:
Max LV 255
Max PV 6
Max PE per PV 8683
PE Size (Mbytes) 4
VGRA Size (Kbytes) 464

Re: How to increase MAX PV in a vg

Rita C Workman — Fri, 16 Nov 2007 14:41:14 GMT

OK..to recap.

1. Check the setting on kernel parm "maxvgs". You can only add up to what this is set at. So change it to something better - maybe 50.

The (16) you see, is the default amount given when you vgcreate and do NOT use the -p option.

2. vgmodify is a nice tool that is available in 11i ver2 and higher.
If your below this O/S, then you can not change what is there, only create something new using the -p <#> option. See man vgcreate.

Which is what everyone above has said....in one way or another.

Rgrds,
Rita