Logical Volume structure

[Troyan Krastev]

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.

[Ashwani Kashyap · Accepted solution]

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

[Ashwani Kashyap]

This is for Vxvm.

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

[Troyan Krastev]

Hi Ashwani,

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

Troy

[Ashwani Kashyap]

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 .

[avsrini]

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.

[avsrini]

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.

[Troyan Krastev]

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