Over the years I have been involved with many disaster recoveries and clearly the teams that had good planning and testing had the best success. During a recovery is not the time to be learning about the behavior of the system. Whenever I had the opportunity to talk to the teams prior to having issues I always reminded that the backup plan is really a recovery plan. We need to meet our Service Level Agreements for backup times and success criteria and we also need to be meet the recovery needs of the business.
With the explosive growth of data statement that starts every article about storage I remind myself that it is up to us to make sure we can prove that we are in control of companies information assets. Especially during a crisis. I learned that best thing I could do was to have a well tested plan so when the call for help happened my team and I was ready. Here is a reminder that the TS7700 R3.1 has improved disaster recovery testing capabilities. When the disaster hits like the one in Figure 1 you will be ready.
With the TS7700 release 3.1 code, concurrent disaster recovery testing is improved with the Flash Copy for Disaster Recovery Testing function. This enables a Disaster Recovery host to perform testing against a point in time consistency snapshot while production operations and replication continues.
With Flash Copy, production data continues to replicate during the entire DR test and the same logical volume can be mounted at the same time by a DR host and a production host. Used in conjunction with Selective Write Protect for DR testing, DR test volumes can be written to and read from while production volumes are protected from modification by the DR host.
All access by a DR host to write protected production volumes will be provided via a snapshot in time, or flash, of the logical volumes. In addition, a DR host will continue to have read access to production original content that has since been returned to scratch.
For more information regarding disaster recovery scenarios take a look at Redbooks publication IBM Virtualization Engine TS7700 with R3.1 and white paper WP102415 IBM® Virtualization Engine TS7700 Series Best Practices - Flash Copy for Disaster Recovery Testing