HP XP P9500 Storage - Manual (Page 66)

7 Pair operations
This chapter provides procedures and prerequisite information for performing Continuous Access
Journal Z copy operations.
Pair operations workflow
Basic Continuous Access Journal Z operations consists of the following.
•
Always check pair status. Each Continuous Access Journal Z operation requires the pair to
be in a specific status.
•
Create the pair, in which the S-VOL becomes a duplicate of the P-VOL.
•
Split the pair, which separates the P-VOL and S-VOL and allows read/write access to the
S-VOL if desired.
•
Restore the pair, in which the S-VOL again mirrors the ongoing, current data in the P-VOL.
•
Delete a pair, which removes the pair relationship from the volumes.
For disaster recovery procedures, see “Disaster recovery operations ” (page 103) .
Check pair status
Every Continuous Access Journal Z operation requires that the pairs have a specific status. Before
performing any operation, check pair status.
•
Find status requirements under the Prerequisites sections for each operation.
•
To view a pair’s current status in the GUI, or review status definitions, see “Monitor pair
activity, status” (page 79) .
Create the initial copy
When you create the initial copy, all data in the P-VOL on the primary storage system is copied
to the S-VOL on the secondary storage system. The P-VOL remains available to the host for I/O
operations.
Prerequisite information
•
The initial copy is performed from the primary storage system.
•
The initial copy can be performed when the volumes are in the status of Simplex.
•
S-VOLs must be offline to all hosts.
•
You will be required to select the volumes you will assign to a pair or pairs by the individual
volume’s CU and LDEV numbers.
•
Connect the primary and secondary systems, and all logical paths must be defined. See
“Configure storage systems for Continuous Access Journal Z, define logical paths ” (page 57)
for more information.
•
Journal volumes must be registered to the journals that are associated with pairs. See “Register
journal volumes in a journal” (page 62) for more information.
•
You will assign master and restore journals to the P-VOL and S-VOL during the operation.
•
If you are creating more than one pair at one time, you must specify the number of volumes
that initial copy operations can be performed concurrently on. See
“Specify number of volumes
for initial copy, resync ” (page 60) for more information.
66 Pair operations