Originally posted by: Landao

Hi all,

I have two servers A nd B and a DiskStorage. My vglcss volume group is in diskstorage A and B servers are connected that storage through fibre channel.
I could export a volume group vglcss from server-A and import it into server-B without losing the data.

My question is that: If server-A failed how can I import volume group vglcss into server-B without exporting it from sever-A?

(PS: Aix version 5.2 and machins are Rs6000 Power p6)

Thanks in advance

Orkhan

Originally posted by: tony.evans

Assuming you don't have any scsi lock issue, you can just import the volume group on system B.

Exporting is optional, and just removes the definitions on the original server and makes sure the structures on the disks are up-to-date.

Originally posted by: jvk

Exporting from server A (in terms of the exportvg AIX command) is not really required.
If server A fails, then its disks will most likely be reserved/locked by this server. Before you import these disks to server B, you must ensure disks are accessible for you from server B. How this can be done? Additional SW like HACMP can do it for you automatically. Otherwise you'll need to clear out reservations with help of tools on your storage box or with help of multipathing SW or some other way. All depends what storage box and what multipathing SW you use, if any etc.

Originally posted by: Landao

Hello all!
We don't use HACMP or other multipathing SW. I know HACMP can do it automatically. But I have not it because it enough for me to do that switching by manually also it need additional license.
My diskstorage is IBM DS4700 and OS in nodes are AIX5.2
And you told me I could clear our reservations with help of tools on my storage box.
How can I do it?
PS. Another persons suggest me to change VG properties: onver this VG to Concurrent Capable? make it as enhanced concurrent
But anothers told it only act while I have HACMP.

Thanks. Your advises valuable for me.