Hitachi ShadowImage for z/OS user guide (HIT9503-96007, October 2007)

ShadowImage for z/OS user guide 105
To perform volume copying, the capacity of the copy source extent must be equal to or larger than the
capacity of the copy target extent. To perform dataset copying, the number of tracks of the copy source
extent and the copy target extent must be the same. Dataset copying allows you to establish up to 16
relationships to the copy source extent.
• FlashCopy Mirror Version 2 can perform dataset copying when:
• The position of the copy source extent is different from the position of the copy target extent.
• The volume of the copy source extent is different from the volume of the copy target extent.
• The copy source extent and the copy target extent are in the same volume, provided that they do not
overlap.
• The data in a single source extent is to be copied simultaneously to multiple target extents.
• Volume copying is also performed simultaneously in the same sourced volume.
• Two source extents overlap, or one of them is an inclusive part of the other (see Figure 50), provided
that the number of overlapping extents in each overlapped area is not more than 16 extents.
Figure 50 Overlap of Copy Source Extents
• FlashCopy Mirror Version 2 cannot perform dataset copying when:
• Any one of the copy target extents is overlapping a copy source or target extent.
• A copy target extent that already has a relationship established is used to establish a new
relationship with a copy source or target extent that overlaps.
Table 46 shows the compatibility between the FlashCopy Mirror Version 2 functions and the user interface
functions.
Table 46 Compatibility between FlashCopy Mirror Version 2 and User Interface Functions
Function User Interface
TSO DFSMSdss ICKDSF ANTRQST
Macro
Volume copy Multi relationship OK OK OK OK
NOCOPY mode OK OK OK OK
COPY mode OK OK OK OK
Dataset copy Multi relationship OK OK NO OK
NOCOPY mode OK OK NO OK
COPY mode OK OK NO OK
Copy mode Multi relationship OK OK OK OK
Change to
NOCOPY mode
NO NO NO OK
NOCOPY mode Multi relationship OK OK OK OK
Change to
NOCOPY mode
OK NO OK OK