PPRC dynamic address switching (P/DAS) is a software function that provides the ability to redirect all application I/O from one PPRC volume to another PPRC volume with minimal application impact. P/DAS works with PPRC volumes only, and cannot redirect activity among XRC volumes.
You can use P/DAS in shared-disk environments, including both sysplex environments and nonsysplex environments. P/DAS switching includes PAV Alias UNBIND for the original PAV base device and Alias BIND to the alternate PAV base device.
The HiperSwap function of GDPS® builds on P/DAS technology but provides the total systems solution to allow application programs to continue to run in a seamless fashion following a failure of one or more primary subsystems. HiperSwap takes the P/DAS technology and creates a true business continuance solution for the customer. Visit http://www.ibm.com/servers/eserver/zseries/gdps.html for more information.