PPRC dynamic address switching (P/DAS) provides the ability to redirect all application I/O from one PPRC volume to another PPRC volume, using P/DAS commands. P/DAS operations are based on the PPRC functions of the 3990 Model 6 Storage Control, and can be used in shared-DASD environments, including Parallel Sysplex® environments. P/DAS allows application-transparent switching of I/O to support the following tasks:

• Planned outages (device or subsystem)
• Device migration
• Workload movement