Hi,

If i want to use SAN disk as the heartbeat for my HACMP. How big should
it be???
It have to be a Enhanced concurrent VG rite??
What is the different between a shared and concurrent VG and how i'm
going to create it???

Thanks

On 5 Feb 2006 10:45:15 -0800, "day88" <patrickkuah@gmail.com> wrote:

>Hi,
>
>If i want to use SAN disk as the heartbeat for my HACMP. How big should
>it be???
>It have to be a Enhanced concurrent VG rite??
>What is the different between a shared and concurrent VG and how i'm
>going to create it???
>
>Thanks

Yes it does need to be an enhanced concurrent mode VG

The heartbeat area is within the header of the disk, so you can
heartbeat over a disk which holds live data.

Create it in CSPOC - I think the default nowardays is to create an
enhanced VG.

Steven

Agree with Steven. You need to create an enhanced concurrent volume
group, available to each node in the cluster. You can either use c-spoc
or do create it on one node and then do an importvg on the other. As it
only actually uses the VGDA (volume group data area) the smallest LUN
size you can configure will do the job. Also, make sure you don't
create your VG as auto varyon as it won't work. You can use the
dhb_read utility to check if it's working correctly;

dhb_read -p hdisk# -r (on first node)
dhb_read -p hdisk# -t (on other node)

You should get something like "link operating normally" if it's
working. You then need to go into smitty hacmp and configure a
heartbeat network.