HP StorageWorks P9000 Reference Manual page 241

The following describes the relationship between the VOLUNIT parameter specification and the
command execution when issuing the YKRESYNC command to reverse the copy direction.
When the VOLUNIT parameter is not specified:
The command is executed only when the copy pair status is SWAPPING.
When the VOLUNIT parameter is specified:
The command is executed even if the copy pair status is not SWAPPING.
NOTE: Usually, to operate by volume only those copy pairs whose statuses do not match due to
reasons such as a failure, specify the CANCEL parameter together with the SELECT(COND)
parameter.
DELTAJNL
Applies to Continuous Access Journal for Mainframe.
Perform a delta resync. Copy to S-VOL only the journals on the P-VOL side that have a differential
with the journals on the S-VOL side. After copying the differential, perform a transition to the DUPLEX
status.
ALLJNL
Applies to Continuous Access Journal for Mainframe.
Perform a delta resync with full copy to resynchronize delta resync pairs. All the information for
the P-VOL is copied to the S-VOL regardless of the differences between the two. After copying has
been completed, perform a transition to the DUPLEX status.
When executing the YKRESYNC command with the ALLJNL parameter for a copy group which
contains one or more copy pairs in the NODELTA status, perform the following procedure:
1. Execute the YKRESYNC command with both the ALLJNL parameter and the ERRCHK parameter
to make sure the command terminates successfully with the return code 0.
2. Execute the YKRESYNC command with only the ALLJNL parameter to make sure there all
copy pairs can perform full copy.
ERRCHK
Applies to Continuous Access Journal for Mainframe.
Identify the cause of the error that occurred when a delta resync or a delta resync with full copy
was executed.
Specify the ERRCHK parameter with either the DELTAJNL parameter or the ALLJNL parameter in
the following cases:
To make sure delta resync (with or without full copy) can be performed correctly before
executing the YKRESYNC command with either the DELTAJNL parameter or the ALLJNL
parameter.
When the copy pair statuses changes to HOLDER status after executing the YKRESYNC
command with the DELTAJNL parameter or the ALLJNL parameter.
If the ERRCHK parameter is specified with the YKRESYNC command, no status transition will take
place.
A message (YKZ251E, YKZ253E, YKZ255E, or YKZ257E) will be displayed to indicate an error
if a copy pair that cannot perform delta resync with or without full copy exists. Remove the cause
of the error according to the message, and then re-execute the YKRESYNC command without the
ERRCHK parameter.
If the ERRCHK parameter is specified and no abnormal copy pairs exist, the command will terminate
normally with the return code 0.
Command details 241