[Linux-cluster] Geographical load balancing & GFS related question!

[Tom Lanyon]

On 25/11/2008, at 4:53 AM, Brain Stormer wrote:

> I know Red Hat Cluster Suite relies on OpenAIS and GFS relies on DLM  
> for locking,
>
> So the question is am I capable to have a DRBD block device running  
> in an active/active mode and have a GFS file system over it with the  
> nodes located in different geographical locations ? considering that  
> there is no multicast/broadcast between the 2 nodes in a cluster and  
> whether DLM will be able to operate in that case.
>
> Also having in mind that the connection between the 2 locations  
> having the nodes is connected with a fiber-optics connections and  
> the delay between the 2 server is not more than 3ms.
>
> Your input is highly appreciated.


If your sites are linked with fiber then surely you can either span  
your VLAN across both sites, or configure multicast routing between a  
VLAN at each site?

You will need multicast between nodes for this to work; as far as I  
know, there is no other solution available.

Regards,
Tom