In addition to ensuring you have enough bandwidth to support your HA solution, you also need to ensure you have the proper plan in place to include ongoing testing or verification.
Most HA environments are complex in nature and require constant management, monitoring and testing to ensure the stability of and confidence in your system. Your IT staff can and should perform regular audits and switchover tests to ensure that your replicated environment is working properly in the even that it is needed. However, Gartner estimates that 50% of all DR (disaster recovery) tests fail and that 95% of all companies never complete DR testing. These statistics are not surprising when you consider that many companies simply don’t have the manpower or financial resources to put toward testing. Many companies keep their technology staff focused on developing and maintaining business applications and managing everyday IT support issues.
If your HA plan does not include ongoing testing and verification, your company will be vulnerable to HA system errors and failures that can turn into costly business downtime and permanently lost business data. Performing routine tests may seem costly up front, but these tests can save your business in the long run by avoiding downtime associated with failed recovery efforts in the event of an outage or disaster.
Next week I will continue to provide you with other common mistakes made in HA and recovery planning.