HP StorageWorks XP Remote Web Console Software - Manual (Page 81)

NOTE: If you delete the TCz Synchronous pair that is created in step 2, the URz pair created in
step 6 will be deleted as well. In addition, if you delete the URz pair created in step 4, the secondary
data volume of the URz pair created in step 6 will be deleted. In this case, you can only perform
deleting operation on the remaining primary data volume.
For detailed information about installing and using TCz Synchronous, see the Hitachi
ShadowImage™ for Mainframe User's Guide: HP XP24000 Disk Array, HP XP20000 Disk Array.
For detailed information about URz journal group configuration, see Journal Group Operations .
For detailed information about port configuration, see “Configuring Port Attributes” (page 99) .
Requirements for Creating URz Pair for Delta Resync Operation
To create a URz pair for delta resync operation, the followings are required.
•
Create the pair in 3DC multi-target configuration
•
Use TCz Synchronous R-VOL in Duplex status as the primary data volume
•
Use URz data volume in Duplex status as the secondary data volume
•
Use the mirror ID from 1 to 3 that is not used by the secondary data volume
•
Fulfill the conditions to combine URz with other functions in “Whether Non-URz Volumes Can
Be Used as URz Volumes” (page 64)
•
The system option mode 506 must be set to ON at all sites
In addition to the above mentioned requirements, all URz pairs in the journal group must satisfy
the following requirements when you create more than one URz pair for delta resync operation:
•
Use the same mirror ID for all pairs
•
Use the same restore journal group for all pairs
Requirements for Performing Delta Resync Operation
To perform delta resync operation properly, you need to specify a URz pair that belongs to the
journal group whose URz pairs meet the following requirements. Note that if any URz pair in the
journal group does not meet the requirements, an error occurs even if the specified URz pair meets
the requirements.
•
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.
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
Once 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.
Combining URz with Other Data Management Operations 81