13.6 Summary of data migration
The route which an installation takes to migrate data to one or more DS6800 storage servers depends on requirements for service levels, whether application down time is acceptable, available tools and cost estimates with certain budget limits.
When coming from an ESS 750 or ESS 800, Metro Mirror seems to be the natural choice, and allows for concurrent data migration with almost no application impact or no impact when the actual switch utilizes P/DAS, although it is quicker and easier to allow for a brief service interruption and quickly switch to the new disk storage server. Because Metro Mirror provides data consistency at any time, the
When the source disk servers are not compatible with the DS6800 and the migration is based on a full volume, physical level, then there are options which depend on various circumstances which are different for each installation. When TDMF or FDRPAS is available and the customer is used to managing volume migration using these software tools, then it is a likely approach to use these tools for a larger scale migration as well. In other circumstances it might be feasible to include the migration as part of a total package when installing and implementing DS6800 disk storage servers. This is possible through IGS services which rely on FDRPAS, TDMF or Piper for z/OS. There is always DFSMSdss, which is still popular, but this approach usually requires an outage of the specific application systems.
Finally, the migration might be used as an opportunity to consolidate volumes at the same time. After a decision has been made about the new volume size, which is preferably a multiple of a
After the migration and storage consolidation you will be using a disk storage server technology which will serve you with promising performance and excellent scalability combined with rich functionality and high availability.
272DS6000 Series: Concepts and Architecture