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Dynamic Device Recognition is a framework for describing the operating parameters and characteristics of SCSI devices to the SCSI CAM I/O subsystem. You can use DDR to include new and changed SCSI devices into your environment without having to reboot the operating system.
Beginning with Digital UNIX Version 4.0, DDR is preferred over the current static method for recognizing SCSI devices, because DDR will not disrupt user services and processes as happens with static methods of device recognition.
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