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3-44 Chapter 3 Preparing for Universal Replicator z/OS Operations
Hitachi Universal Replicator for IBM /OS User’s Guide
• Status of the primary data volume is Hold
• Using the volume of TCz Synchronous pair as the primary data volume
If you use TCz Synchronous M-VOL, the pair status should be Duplex.
If you use TCz Synchronous R-VOL, the pair status should be Suspend.
Note: Check the pair status after the Business Continuity Manager
YKSUSPEND REVERSE command and YKRESYNC REVERSE
command are executed.
• Secondary data volume uses two mirror IDs; the status of the secondary
volume which uses one of the two mirror IDs is Hold, and the status of the
secondary volume which uses another mirror ID is Duplex or Suspend
• All differential data between the primary and secondary data volume is
stored in the master journal group
Note: Right after you have created the URz pair for delta resync operation,
or if the failure occurred at the primary site right after the recovery of TCz
Synchronous or URz pair, only a part of the differential data between the
primary and secondary data volume may be stored in the master journal
group.
When either of the abovementioned requirements is not fulfilled, usually an
error occurs and delta resync operation will fail. Especially in the following
cases, delta resync operation will not be performed since the necessary journal
data does not exist:
• When the primary data volume in the URz pair for delta resync operation is
updated after creating the URz pair, but URz primary data volumes that are
also used as TCz Synchronous primary data volumes are not updated in the
primary site
• When the volumes in the primary site are updated after splitting TCz
Synchronous pair
• When the secondary data volume is updated after splitting URz pair
• As a result of the update of the primary data volume after splitting URz pair,
when the capacity of the journal data exceeds 70% of the journal volume
in TCz Synchronous secondary site
• When the primary data volume in the URz pair for delta resync operation is
updated and then the capacity of the journal data exceeds 70% the journal
volume in the primary site of URz pair for delta resync operation
• When no volumes (including volumes after failover or failback) in the
primary site are updated after creating the URz pair for delta resync
operation
• When delta resync operation is performed within about one minute after a
volume in the primary site is updated after the URz pair for delta resync
operation is created