HP XP7 Storage - Manual (Page 48)

5. For Secondary Volume Write, specify whether data can be written to S-VOLs in the mirror
while it is split.
•
Enable: The host writes data to S-VOLs in the mirror. Available only when the selected
mirror’s Attribute is Master. If Restore, Disable is used automatically.
•
Disable: The host does not write data to S-VOLs in the mirror.
6. For Split Mode, specify whether data is written to S-VOLs in the mirror before the split operation
runs.
•
Flush: Copies all update data from to S-VOLs in the mirror before the split.
•
Purge: Prevents update data from being copied to S-VOLs in the mirror before the split.
Uncopied data is copied to the S-VOL when the pair is resynchronized.
7. Click Finish.
8. In the Confirm window, review the settings and enter a task name in the Task Name box.
9. Click Apply to save your settings to the system.
Creating point-in-time copies
Continuous Access Journal allows you to make Point-in-Time (PiT) copies of volumes in the same
journal. Point-in-Time describes a copy of data made when you it.
Prerequisite information
Review the prerequisite information in “Splitting Cnt Ac-J pairs ” (page 46) .
Procedure 4 To make PiT copies of the volumes in a journal
1. Stop all write I/Os from hosts to P-VOLs in the journal.
2. Split the mirror. Make sure to specify Flush for Split Mode.
3. When the status of all pairs in the journal changes to PSUS, the operation is completed. Resume
write I/O to the P-VOLs.
Resynchronizing Cnt Ac-J pairs
Resynchronizing a pair updates the S-VOL with differential data that accumulated since the pair
was split. After the pair is resynchronized, the S-VOL is again updated via the journals.
48 Cnt Ac-J pair operations