topic Volume Group Extending.... in Operating System - HP-UX

Volume Group Extending....

Dave Cast — Wed, 10 Mar 2010 15:39:59 GMT

Can a volume group be extended ****WITHIN**** the SAME disk (yes, I know you can extend by adding a DIFFERENT disk) once created?

Re: Volume Group Extending....

James R. Ferguson — Wed, 10 Mar 2010 15:45:10 GMT

Hi Dave:

On 11.23 (with patches) and on 11.31 you have 'vgmodify' to fiddle with the attributes of an existing volume group.

Regards!

...JRF...

Re: Volume Group Extending....

Dave Cast — Wed, 10 Mar 2010 15:56:00 GMT

Hmmmm - that's sounds like it has a potential for being ugly....being even more ugly now that I've read the man page on vgmodify....

Generally speaking it doesn't sound like there's an 'easy' (smh doesn't have the option to extend within the disk) way....

Re: Volume Group Extending....

James R. Ferguson — Wed, 10 Mar 2010 16:02:58 GMT

Hi (again) Dave:

I'm not sure what it is you want to do. Perhaps this whitepaper will give you a better view of 'vgmodify':

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

Regards!

...JRF...

Re: Volume Group Extending....

Patrick Wallek — Wed, 10 Mar 2010 16:07:00 GMT

vgmodify actually works pretty well. I have used a version of it for 11.11 and had no trouble. I would just advise reading the man page carefully and make sure you have good backups.

Re: Volume Group Extending....

Dave Cast — Wed, 10 Mar 2010 16:19:31 GMT

James,

I have a a LUN presented from an EVA 8000 - I increased the size from 200G to 250G on the EVA. I ran ioscan -fnC Disk on the OS (11.31) and it sees the new size of 250G at the disk level, but when I go to extend the VG that's on that disk - the only option I have is to extend to a different disk.

Re: Volume Group Extending....

Patrick Wallek — Wed, 10 Mar 2010 16:26:12 GMT

That's exactly where 'vgmodify' comes into play.

On my HP-UX 11.11 server I ran:

vgmodify -e 20000 vg04

To increase the maximum number of physical extents to 20,000 for VG04.