Advanced Copy Services comprises the following functions
and enhancements. Mirror functions provide a consistent point-in-time
copy of data at the recovery site, while the data at the recovery
site for Copy functions is not necessarily
consistent.
- Metro Mirror, also known as (synchronous) Peer-to-Peer Remote Copy (PPRC)
- Global Mirror, also known as (asynchronous) Peer-to-Peer Remote Copy
- Global Copy, also known as PPRC-Extended Distance (PPRC-XD)
- Metro/Global Copy
- Global Mirror for System z®,
also
known as z/OS Global Mirror (zGM)
and Extended Remote Copy (XRC), which includes Coupled
Extended Remote Copy (CXRC) - Metro/Global Mirror, also known as synchronous PPRC combined with Global Mirror
- Multi-Target Mirror
(MTPPRC)
- FlashCopy®
- Failover/Failback
- SnapShot
- Concurrent Copy (CC)
Table 1 shows
how each of the Advanced Copy Services
copy functions falls into one of two groups. Dynamic copy functions
constantly update the secondary copy as applications make changes
to the primary data source. Point-in-time copy functions provide an
instantaneous copy, or view, of what the original data looked like
at a specific point in time.
| Type of copy | Copy function names |
|---|---|
| Dynamic copy of data | XRC, CXRC, PPRC, Global Mirror |
| Point-in-time copy of data | FlashCopy, SnapShot, and Concurrent Copy |
Note: Advanced Copy Services largely relies on a data movement
engine, the system data mover (SDM), to efficiently and reliably move
large amounts of data between storage devices. For more information,
see System data mover.