Facility wide DR/Continuity

[rdobbins at arbor.net (Roland Dobbins)]

On Jun 3, 2009, at 11:15 PM, gb10hkzo-nanog at yahoo.co.uk wrote:

> For example, consider the licensing and hardware costs involved in  
> running something like Oracle Database in active/active mode  (in a  
> topology that is supported by Oracle Tech Support).

In my experience, it's no more expensive in terms of hardware/software  
licensing costs to run active/active, and actually less in terms of  
opex costs due to issues raised previously in this thread, as well as  
a host of others.

Note that running active/active doesn't necessarily mean doing  
something like running a clustered database back-end, utilizing vendor- 
specific HA solutions.  It can be done via a combination of caching,  
sharding, distributed indexing, et. al. - i.e., via application  
structuring and logic.

-----------------------------------------------------------------------
Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

         Unfortunately, inefficiency scales really well.

		   -- Kevin Lawton