DFSMS SDM Copy Services

IBM's Data Facility Storage Management Subsystem (DFSMS™) SDM (System Data Mover) Copy Services are enterprise-level data duplication and disaster recovery capabilities which include: XRC (Extended Remote Copy), CXRC (Coupled XRC), PPRC (Peer to Peer Remote Copy), SnapShot, CC (Concurrent Copy), FlashCopy.

Features

• Provide a comprehensive disaster recovery solution for the z/OS environment.
• Deliver a range of data duplication solutions that solve the customer requirement for an immediate point-in-time copy of data.

Infrastructure benefits

	Extended Remote Copy (XRC) - Disasters occur in many forms. While it is possible for a disaster to stop all processing at a single point in time, it is more likely that the disaster will interrupt operations in stages, occurring over several seconds or even minutes. Data transactions are not neatly stopped all at once, but crash ungracefully as facilities and channels fail at different times and in different ways. You must therefore be able to recover from a potential disaster that causes intermittent and gradual system failures. IBM's XRC function addresses this real-world situation. XRC can run on the application system or on any system that is attached to the XRC-managed volumes. XRC is an optional feature of IBM's Enterprise Storage Server (ESS).
	Peer-to-Peer Remote Copy (PPRC) - Like its cousin XRC, PPRC is designed to maintain a current copy of your application data at a remote site. PPRC is a hardware-based disaster recovery solution and is a feature on IBM's Enterprise Storage Server (ESS). In addition to protecting data, PPRC also functions as a regular-workday tool to move and migrate data between storage devices.

Application benefits

	Concurrent Copy (CC) - Concurrent Copy (CC) enables customers to copy or dump data while applications are updating the data. Both IMS and DB2 customers can use CC for their backups. CC is supported on the IBM Enterprise Storage Server (ESS), the IBM RAMAC Virtual Array (RVA), and on most other vendor storage subsystems that support the zOS environment.
	FlashCopy - FlashCopy provides a fast data duplication capability. This option helps eliminate the need to stop applications for extended periods of time in order to perform backups and restores. FlashCopy is automatically initiated by DFSMSdss on IBM Enterprise Storage Servers (ESS) with the FlashCopy feature.
	SnapShot - The SnapShot function enables customers to produce almost instantaneous copies of data sets, volumes, and VM minidisks - all without data movement! SnapShot is automatically initiated by DFSMSdss on storage subsystems with the SnapShot feature.