Extend the volume group on cluster system

[wali chabi]

Hi!
I have the cluster with two nodes. In my autoraid I had 5 LUN on which I create one vg. Now I create the other LUN and want to extend my vg on this LUN. How to do this?

Thank you for your reply

[Steven E. Protter]

Shalom,

To do this hot, you need OnlineJFS or a tool that ships with CFS to extend the filesystem.

I would suggest scheduling downtime to cover yourself on this because extending the filesystem hot can lead to unexpected outcomes.

Here is the doc you need:
http://www.repton.co.uk/library/symantec_storage_foundation_cluster_file_system.pdf

SEP

[Frank_W · Accepted solution]

Hi,


You can extend the volumegroup on the active clusternode:
- vgextend vgXX /dev/dsk/cXtYdZ
- vgexport -p -m vgXX.map -f vgXX.dev /dev/vgXX
Then copy the vgXX.map and vgXX.dev files to the backup-node.

On the backup system, you have to vgexport the volumegroup and then vgimport it with the new devices:
- vgexport vgXX
- mkdir /dev/vgXX
- mknod /dev/vgXX/group c 64 0xXX0000
- vgimport -m vgXX.map -f vgXX.dev /dev/vgXX
- vgchange -a r vgXX
- vgcgfbackup vgXX
- vgchange -a n vgXX


The rest depends on what are you going to do with the additional diskspace?
- extend an existing lvol?
- create a new lvol?

[wali chabi]

Hi Frank W.
Thank you for your help. After extending the volume group, I'd like to extend an existing lvol. More detail for the procrdure will help me.

[Asif Sharif]

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=837773
Here is the Technical knowledge base - document

http://www12.itrc.hp.com/service/cki/docDisplay.do?docLocale=en&docId=emr_na-c01053585-1

Regards,
Asif Sharif

[Jeeshan]

here is a similar one

http://forums12.itrc.hp.com/service/forums/questionanswer.do?threadId=1052984

[Frank_W]

Hi,

first you have to extend the volume lvolY to the new disk cXtXdX:

lvextend -l /dev/vgXX/lvolY /dev/dsk/cXtXdX

Then you have to extend the filesystem:

- If you have onlineJFS installed:

fsadm -F vxfs -b /mountpoint

- If you don´t have onlineJFS you have to unmount the filesytem and then extend it:

extendfs /dev/vgXX/rlvolY

Be sure you have an backup of your data!!

Check the lvol-config on the standby node:

vgchange -a r vgXX
vgdisplay -v vgXX
vgchange -a n vgXX

If this node doesn´t sees the right information, do the vgexport/vgimport again