Zero downtime for vApp in vCloud Director

[Techstarts]

Hi Guys,

Just want to your advice, is it possible to achieve Zero downtime for vApp within site.

As I see we can have vSphere HA which will bring VMs up on within 5 minutes.

But I have customer who needs facility to do rolling upgrade and have no downtime even during maintenance window.

can you help me from your experience?

For such solution i have always offered FT (for one vCPU) or in-guest clustering i.e. Linux/MSCS/Veritas/RAC offering.

But none of these are supported by vCloud director.

Then how do we offer such solution.

Appreciate a response on this.

Hope this is the right forum

Thanks,

Preetam

[JoshuaAndrewsVM]

Can the resource/application be load balanced? If it has a back-end database does that support clustering?

[Techstarts]

Here it is oracle database which needs to be highly available, as application queries the database. I guess my question should have been how to make database highly available within site when vCloud director is front end

[JoshuaAndrewsVM]

Forget the fact it is in a vApp.

If it were a physical server how would you do it?  I don't know Oracle but I assume it has a clustering mechanism.  Two servers each with a copy of the database, some sync method, some load balance method. 

Set the load balance method to only reference host B, ensure database is synced, take A offline for maintenance.