DLE( DynamicLun Expansion)

[nguyen kyphung]

Hi,

Someone has already used the new functionality
of LVM ( DLE ) to increase dynamically the size of LUN defined within a VG.

Regards

Ky Phung NGUYEN

[Shrikant Lavhate]

Hi,

Check this doc:

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

[nguyen kyphung]

Hi,

Yes I have read this White Paper. However, when I use the command vgmodify , it doesn't perform the wanted action, i.e the extension of Lun within a VG.

Regards

Ky Phung

[Duncan Edmonstone]

How about some more info then... llike hwat version of HPUX? 11iv2 or 11iv3? If 11iv2, do you have the required patches installed? What was the sequence and syntax of commands you issued up to the point of failure?

HTH

Duncan

[Duncan Edmonstone]

How about some more info then... like what version of HPUX? 11iv2 or 11iv3? If 11iv2, do you have the required patches installed? What was the sequence and syntax of commands you issued up to the point of failure?

HTH

Duncan

[Torsten.]

"it doesn't perform the wanted action"

What command did you run?
What was the resulting message?

[nguyen kyphung]

Hi,

Sorry, I forget to specify that I am doing the test on a HPVM guest with a disk defined as a LVOL on the Host.A VG is created with this disk.
When I extend the LVOL on the host , and then use vgmodify to take in account this extension, it does not work.
Finally, I have found a sequence to make it works :

- vgexport of the VG on the guest
- extend the LVOL on the host
- use hpvmmodify with option -d to remove the LVOL to the guest
- use hpvmmodify with option -a to add the LVOL to the guest
- vgimport the VG on the guest
- vgmodify the VG on the guest. And then , the extension is seen on the guest.


Regards

Ky Phung

[Torsten.]

You already found out the only working way, see the HPVM docs:

"No changes to any virtual media can take place on the VM Host until the virtual device that uses
the media is removed from the active VM."

The reason is the virtual device management by the virtual machine.

[nguyen kyphung]

Finally, I have found a sequence to make it works :

- vgexport of the VG on the guest
- extend the LVOL on the host
- use hpvmmodify with option -d to remove the LVOL to the guest
- use hpvmmodify with option -a to add the LVOL to the guest
- vgimport the VG on the guest
- vgmodify the VG on the guest. And then , the extension is seen on the guest.