Gdps

capacity planning and application stress testing. For more information on Parallel Sysplex Professional Services, visit IBM’s Web site at ibm.com/servers/eserver/zseries/pso/ services.html.

GDPS supports both the synchronous Peer-to-Peer Remote Copy (PPRC) as well as the asynchronous Extended Remote Copy (XRC) forms of remote copy. The GDPS solution, based on Peer-to-Peer Remote Copy (PPRC), referred to as GDPS/PPRC, is designed with the attributes of a continuously availability solution. PPRC is a hardware solution that is designed to synchronously mirror data residing on a set of disk volumes, called the primary volumes in site 1, to secondary disk volumes on a second system in site 2. Only when the primary storage subsystem receives “write complete” from the secondary storage sub- system is the application I/O signaled completed. GDPS/ PPRC complements a multisite Parallel Sysplex environment by providing a single, automated solution to dynamically manage disk and tape storage subsystem mirroring, pro- cessors, and network resources designed to allow a busi- ness to attain “continuous availability” and near transparent business continuity/disaster recovery without data loss. GDPS/PPRC provides the ability to perform a controlled site switch for both planned and unplanned site outages, while maintaining data integrity across multiple storage subsystems. GDPS/PPRC is designed to be application independent and therefore is expected to be able to cover the customer’s complete application environment. GDPS/ PPRC is designed to allow a customer to meet a Recovery Time Objective (RTO) of less than an hour, a Recovery Point Objective (RPO) of no data loss, and protects against met- ropolitan area disasters (up to 40 km between sites). On the other hand, the GDPS solution based on Extended Remote

Copy (XRC), referred to as GDPS/XRC, has the attributes of a Disaster Recovery solution. XRC is a combined hard- ware and software asynchronous remote copy solution.

The application I/O is signaled completed when the data update to the primary storage is completed. Subsequently, a DFSMSdfp™ component called System Data Mover (SDM), typically running in site 2, is designed to asynchronously ofﬂ oad data from the primary storage subsystem’s cache and updates the secondary disk volumes.

In GDPS/XRC, the production system(s) located in site 1 can be a single system, multiple systems sharing disk, or a base or Parallel Sysplex cluster. GDPS/XRC is designed to provide a single, automated solution to dynamically manage storage subsystem mirroring (disk and tape)

to allow a business to attain “near transparent” disaster recovery with minimal data loss. GDPS/XRC is designed to provide the ability to perform a controlled site switch for an unplanned site outage, maintaining data integrity across multiple volumes and storage subsystems. GDPS/XRC is designed to allow a customer to meet a RTO of one to two hours, an RPO of less than a minute, and helps protect against metropolitan as well as regional disasters, since the distance between sites is unlimited. XRC can use either common communication links and channel extender technology or dark ﬁ ber as the connectivity between sites.

GDPS/XRC is designed to be application independent and therefore is capable of covering the customer’s complete application environment.

GDPS requires Tivoli® NetView® for z/OS, Tivoli System Automation for z/OS, and remote copy technologies.

Note: Dark ﬁ ber refers to dedicated strands of ﬁ ber optic cable with no electronics between the ends (source and destination).