Hitachi ShadowImage for IBM z/OS User"s Guide (T5213-96002, June 2007)

2-8 About ShadowImage™ for IBM
®
z/OS
®
Operations
Hitachi ShadowImage™ for IBM
®
z/OS
®
User’s Guide
When the steady split operation starts, the pair status changes to
SP-pending. The whole S-VOL data or differential data at that time will be
copied to the T-VOL. When the steady split operation is complete, and you
have full read/write access to the split T-VOL (even though it is still
reserved). If you want to quickly finish the copy operation to access the
T-VOL, make the S-VOL offline before the operation.
For information about Read/Write operations from host servers to S-VOLs
and T-VOLs of SIz pairs during steady split operation, see Table 5-2.
• Split pair operation by At-Time Split
To split pair by the At-Time Split function, you need Business Continuity
Manager software. To perform the split operation by using the At-Time
Split function, you must specify a copy group or register the split time in
the copy group. The split time indicates the time when you want to store
the S-VOL data to the T-VOL. For example, if you register the consistency
group of ShadowImage for z/OS as the copy group of the Business
Continuity Manager, the At-Time Split function enables you to copy data
from the SIz S-VOLs in the same consistency group to T-VOLs
simultaneously. The T-VOLs will contain the same data as the S-VOLs when
the Split operation is performed.
Figure 2-4 and Figure 2-5 show the outline of the At-Time Split function.
Legend
: At-Time Split function
S-VOL S-VOLS-VOL S-VOL
T-VOL T-VOLT-VOL T-VOL
Specify a copy group and split pairs
Pairs in the same
consistency group
Business Continuity Manager
Figure 2-4 Split pair operation by At Time Split (Specifying Copy
Group)