HP XP Business Copy Software - Manual (Page 10)

Using PPRC” (page 93) describes and provides instructions for using PPRC commands to create
and maintain SIz pairs on the XP storage system.
ShadowImage for Mainframe Operations
This section describes the main operations for ShadowImage for Mainframe.
Set Reserve Attribute Operation
The ShadowImage for Mainframe set reserve attribute operation reserves a volume so that it can
be used as an SIz T-VOL. Reserved volumes can only be used as SIz T-VOLs. The XP storage system
rejects all write operations to reserved volumes (unless in Split or V-Split status). You can reserve
up to 16,384 volumes in one XP storage system.
When TSO or ICKDSF commands are used to establish SIz pairs, the T-VOLs do not need to be
reserved. The CESTPAIR and PPRCOPY ESTPAIR commands require that potential T-VOLs be offline
to the host. For details, see
“Performing ShadowImage for Mainframe Pair Operations Using PPRC”
(page 93) .
Add Pair Operation
To create (add) an SIz pair, the volume, which will be the S-VOL, must be in the simplex state. You
may set reserve attribute on the T-VOL before adding it to an SIz pair. You can also create a pair
with an unreserved simplex volume. For detailed information about how to create SIz pairs, see
“Adding Pairs” (page 70) and “Performing Pair Addition and Pair Splitting” (page 77) .
When you create a new volume pair, initial copy starts and all the data in the S-VOL is copied to
the T-VOL.
Figure 2 (page 11) shows the change of the status of a pair from the start to end of the
initial copy operation.
10 About ShadowImage for Mainframe Operations