create new lv on hp serviceguard cluster

[Tom Stewart_2]

I need to create a new dbf file on a HP-UX service guard cluster running oracle RAC. Can someone review the steps below to create a raw device and tell me if they are correct.

On the main node
vgchange -a n /dev/vgxx
lvcreate -L 100 -n newlv /dev/vgxx
vgexport -p -f /tmp/vgxx.export
copy vgxx.export to second node

On second node
vgimport -f vgxx.export
vgchange -a n /dev/vgxx
vgchange -S y -c y /dev/vgxx

On both nodes
vgchange -s s /dev/vgxx

Let me know if I left out any steps as this needs to be done on a live system so I would like to be sure it is correct

Thanks in advance

[Steven E. Protter · Accepted solution]

Shalom,

steps look good, can't do any lvm work while mounted in shared mode.

Shmuel

[Duncan Edmonstone]

I would advise you to read this document:

http://docs.hp.com/en/7389/LVM_SNOR_whitepaper.pdf

This is the *only* way you can change a VG configuration online with SLVM in a RAC configuration. If you don't have the necessary patches discussed at the end of the document you're going to have to take the app offline (or at least the relevant tablespaces offline).

HTH

Duncan

[Sundar_7]

Couple of very minor points

1) With vgexport and vgimport you will need to specify the volume group name.

If you dont use the -s option with vgexport then you will need to manually specify the Physical Volumes with vgimport.

2) On the second node, before you can do a vgimport, you will need to export the VG export (ofcourse, assuming that this is an exsiting VG that has previously been imported on to the second node).

[Tom Stewart_2]

Thanks for the reply, how do I unshare the VG?

Thanks

[melvyn burnard]

folow the instructions in http://docs.hp.com/en/7389/LVM_SNOR_whitepaper.pdf
This gives you step by step commands

[Tom Stewart_2]

Thanks for the responses all