HP StorageWorks XP Remote Web Console Software - Manual (Page 136)

136 Hitachi TrueCopy z/OS for HP XP12000/XP10000 and SVS 200 storage systems
NOTE: The options can be modified and/or canceled after you have set them. See ” Modifying
parameters and omitting selected volumes ” on page 122.
To resume all split/suspended TC390A pairs in a consistency group, verify that the Resume Range
option on the Resume Pair window is set to Group.
7. To execute the Resume Pair requests quickly, select the Use Time-Saving Mode check box above the Pair
Settings Parameter list (Resume Pair).
8. Click Apply on the TrueCopy main window to resume the specified pair(s).
9. From the TrueCopy main window, verify that the TC390 pair(s) is/are displayed correctly (Pending
duplex or Duplex status) in the Volume list.
CAUTION: If a timeout error occurs after clicking the Use Time-Saving Mode option, confirm on the
TrueCopy main window for which volumes the Resume Pair operation could not be performed.
Deselect the Use Time-Saving Mode option for the failed volumes and retry the Resume Pair
operation.
Deleting TrueCopy volume pairs (Delete Pair)
A TC390 pair should be deleted from the MCU only when it is no longer necessary to maintain a remote
copy of the M-VOL. When a TC390 volume pair is deleted from the MCU, the MCU stops all TC390 copy
operations for that pair and changes the pair status of the M-VOL and R-VOL to simplex. After a pair is
deleted, the MCU continues to accept all subsequent write I/O operations to the M-VOL and will not keep
track of the M-VOL updates.
A TC390 pair should be deleted from the RCU only if you need to access the R-VOL, such as to perform
ICKDSF on the R-VOL (see ” ICKDSF considerations for TrueCopy volumes ” on page 140) or for disaster
recovery (see ” TrueCopy disaster recovery operations ” on page 144). When a TC390 volume pair is
deleted from the RCU, the RCU changes the R-VOL pair status to simplex, but does not change the pair
status of the corresponding M-VOL. When the MCU performs the next TC390 operation, the MCU detects
that the R-VOL status changed and changes the status of the M-VOL to suspended-delete pair to RCU.
When you delete a pair from the RCU to access the R-VOL, remember that the R-VOL and M-VOL have the
same VOLSER and take appropriate precautions to prevent a system problem due to duplicate VOLSERs. To
restart a pair that was deleted from the RCU, you must first delete the pair from the MCU, and then add the
pair from the MCU using the appropriate initial copy option (Entire or No Copy) to restart the pair.
You can delete all TC390 Synchronous pairs between an MCU and RCU (same CU image). You can also
delete all TC390A pairs in a consistency group by connecting to the MCU. The TC390A pair status will
change to deleting when the delete operation is accepted by the MCU and RCU, and then to simplex after
the internal delete pair process is complete. In addition, you can delete TC390A pairs according to their
consistency status (for example, for disaster recovery) by connecting to the RCU (the RCU maintains the
consistency status).
NOTE: The CDELPAIR TSO command can be used to delete TC390 pairs and TC390A groups of pairs
from the MCU (see ” Using PPRC commands for TrueCopy ” on page 157).
CAUTION: For information about duplicate VOLSERs, see the caution in ” Duplicate VOLSER ” on
page 46.
As a general rule, when you want to delete a TC390A pair from the MCU, it is strongly recommended that
you perform the Delete Pair operation after the update copy operation is completed. If you demand the
Delete Pair operation while the update copy process is still in progress, it will take a long time to complete
the Delete Pair operation. However, when you urgently need to delete a TC390A pair, you can perform the