The specific situation, defined priorities and the disaster recovery (DR) plan at hand will define how to perform your customer's DR testing.
Keep in mind that redundancy has a huge impact on the DR exercise.
DR documentation needs to be updated continuously and reviewed periodically; a DR test must execute the documented steps meticulously. For instance, when a new system or application is procured for a customer, the DR plan should be updated and tested to account for those additions.
A solid change management and verification process must be in place to ensure that changes are performed according to procedure. Change management tools like Finisar Corp.'s NetWisdom, Onaro Inc.'s SANscreen, Tek-Tools Inc.'s StorageProfiler, as well as those tools built into storage, network and system management suites, track changes in your customer's environment that could ultimately make or break a DR plan.
For detailed DR planning considerations, read the full feature from Storage magazine: Disaster recovery: Test, test and test some more.
This was first published in February 2007