topic Logical Volume structure in Operating System - HP-UX

Logical Volume structure

Troyan Krastev — Mon, 09 Dec 2002 01:51:26 GMT

Hi All,

In AIX LVM on every LV there is a Logical Volume Control Block (LVCB) in the first 512 bytes that should not be overwritten.
Is there something similar in HP LVM or HP VxVM? Can you please point me to some documentation where I can read about it.

Thanks in advance,
Troy.

Re: Logical Volume structure

Ashwani Kashyap — Mon, 09 Dec 2002 02:23:06 GMT

Take a look at this document for HP's LVM .

http://www1.itrc.hp.com/service/iv/docDisplay.do?docId=/DE_SW_UX_swrec_EN_01_E/LVM.pdf

Re: Logical Volume structure

Ashwani Kashyap — Mon, 09 Dec 2002 02:25:03 GMT

This is for Vxvm.

http://www1.itrc.hp.com/service/iv/docDisplay.do?docId=/DE_SW_UX_swrec_EN_01_E/VxVM.pdf

Re: Logical Volume structure

Troyan Krastev — Mon, 09 Dec 2002 15:00:57 GMT

Hi Ashwani,

Thank you so nuch for the great information. Is there a way I can download the whole book?

Troy

Re: Logical Volume structure

Ashwani Kashyap — Mon, 09 Dec 2002 15:07:14 GMT

Yes, go to the knowledge trees sectipn of the ITRC home page , then software recovery handbook , then LVM , and then right click on the LVM icon and save it as whatever you want .

Re: Logical Volume structure

avsrini — Tue, 10 Dec 2002 01:41:17 GMT

Hi Troy,
VxVM is not HP's. It is from Veritas. If you need more info on VxVM check veritas;s knowledge base site.
http://support.veritas.com
for HP you can check in
http://docs.hp.com
as well.

HP LVM,
Yes first 2912kb of the boot disk is reserved for LVM
Headers. For non-boot disks max one PE is alloted. i.e. 4MB default.

Veritas VxVM
I think it reserves 4Kb for private region.

WWR
Srini.

Re: Logical Volume structure

avsrini — Tue, 10 Dec 2002 01:46:51 GMT

Hi Troy,
Sorry mate VxVM reserves private region in no. of cylinders.

check this.
http://seer.support.veritas.com/search_forms/SearchFrame.asp?SearchTerm=private%20region%20size&Path=seer%2esupport%2everitas%2ecom%2fdocs%2f248621%2ehtm

This will give you more details.

WWR
Srini.

Re: Logical Volume structure

Troyan Krastev — Tue, 10 Dec 2002 16:12:33 GMT

Hi Srini,

What I am trying to do is to ???dd??? (disk duplicate) an LV to another one. If there is some private region on the LV obviously I have to skip it. So my question is:
When I have Logical Volume(LVM)/Volume (VxVM), is it all usable space?

Thanks,
Troy