HP XP Business Copy Software - Manual (Page 101)

ShadowImage for z/OS user guide 101
in the Preset Volume List box on the ShadowImage main window, right-click to display the pop-up menu,
and then click Detail.
Using Compatible Mirroring for IBM FlashCopy Version2
To enable Compatible Mirroring for IBM FlashCopy Version2 (shortened to FlashCopy Mirror Version 2
where applicable hereafter) to function on the local disk array, the ShadowImage for z/O feature and
software and the FlashCopy Mirror Version 2 feature and software must be installed and enabled on the
local disk array.
In some cases, there may be a need to install additional shared memory before installing FlashCopy Mirror
Version 2. For details, please contact your HP account representative.
PPRC TSO commands and/or DFSMSdss and/or ICKDSFcommands issued from the host may be used to
perform FlashCopy Mirror Version 2 operations on the local disk array. See ” Using Compatible Mirroring
for IBM FlashCopy Version 2 Host Commands ” on page 127 for further information on using PPRC TSO
commands and DFSMSdss these commands.
CAUTION: FlashCopy Mirror and FlashCopy Mirror Version 2 cannot be used simultaneously. If one or
more FlashCopy Mirror pairs still exist in the disk array, you cannot establish any FlashCopy Mirror Version
2 pairs until you withdraw all the existing FlashCopy Mirror pairs.
Overview of Compatible Mirroring for IBM FlashCopy Version2
The FlashCopy Mirror Version 2 function provides a fast data replication capability. This function allows
you to copy the source data to a targeted volume virtually or physically. Creating the pair by FlashCopy
Mirror Version 2 is called “establishing relationship”. Once a FlashCopy Mirror Version 2 pair is created,
hosts can access data that is copied to the targeted volume.
When you want to copy the data according to dataset, you specify the copy range, then the FlashCopy
Mirror Version 2 creates a pair of only the specified dataset. The copy range is called the “extent”. The
smallest unit used to measure the extent is called the “track”. When the copy source extent and the copy
target extent are in the different volumes, the volume that contains the copy source extent is called an
S-VOL, and the volume that contains the copy target extent is called a T-VOL.
FlashCopy Mirror Version 2 allows you to create up to 16 pairs from one extent. The copy source extent
and copy target extents may co-exist in the same volume. The figure below illustrates the examples of
FlashCopy Mirror Version 2 pairs.
Figure 46 Examples of FlashCopy Mirror Version 2 Pairs Created Between Extents