Hitachi ShadowImage for z/OS user guide (HIT9503-96004, June 2006)

40 ShadowImage for the XP1024/XP128/XP12000/XP10000
Combining ShadowImage for z/OS (SIz) with Universal Replicator for z/OS (URz)
URz volumes can be assigned to SIz pairs, and SIz volumes can be assigned to URz pairs.
NOTE: A Universal Replicator for z/OS primary volume (P-VOL) means a primary data volume of
Universal Replicator for z/OS. A Universal Replicator for z/OS secondary volume (S-VOL) means a
secondary data volume of Universal Replicator for z/OS.
NOTE: SI390 is recommended for intra-disk array copy operations. If ShadowImage for z/OS is not
installed, Universal Replicator for z/OS (synchronous only) can be used to copy within the same local disk
array. This URz configuration requires at least one Fibre Channel interface cable loop (minimum of two is
recommended).
ShadowImage for z/OS and Universal Replicator for z/OS can function together in the same local disk
array to provide both internal and remote backup for important data.
To query the status of an SIz pair when SIz and Universal Replicator for z/OS pairs share the same
volume, do the following:
• Query the SIz S-VOL and T-VOL status from the host if the SIz S-VOL and URz P-VOL share the same
volume
• Query the SIz T-VOL status from the host if the SIz S-VOL and URz S-VOL share the same volume
ShadowImage for z/OS supports multiple T-VOLs for each S-VOL. If you issue a pair status query to an SIz
S-VOL, the status for only one SIz pair is reported (the pair with the T-VOL having the lowest LDEV ID). To
obtain the pair status for the SIz pairs with the other T-VOLs, direct the host query to the specific T-VOL
using the T-VOL’s LDEV ID in the host command. The SIz remote console software displays the LDEV ID and
SIz pair status of all T-VOLs associated with an S-VOL.
When you perform a PPRC command to the Siz/URz shared volumes to query the pair status, the disk
array reports pair status of the SIz. To query pair status of the URz from the host, use the Business
Continuity Manager. For details regarding how to use Business Continuity Manager, please refer to the
Business Continuity Manager User and Reference Guide.
Table 12 lists the currency of the data on shared SIz/URz volumes based on the SIz and URz pair status.
The configuration shown in Figure 16 is an example of a volume that is functioning as both an SIz S-VOL
and a URz P-VOL. This configuration allows you to:
• Use ShadowImage for z/OS to provide on-site backup copies of URz P-VOLs, and/or
Table 12 Currency of a shared SIz and URz volume
SIz Pair Status URz Pair Status
Pending Duplex Suspended
Pending Not current Not current Not current
Duplex Not current Not current CURRENT
SP-Pending Not current Not current CURRENT
V-Split Not current Not current CURRENT
Split CURRENT CURRENT CURRENT
Resync Not current Not current CURRENT
Resync-r - - CURRENT
Suspended Not current Not current Not current