HP XP7 Storage - Manual (Page 43)

5 Cnt Ac-J pair operations
This chapter provides instructions for performing Continuous Access Journal pair operations.
Pair operations workflow
A typical workflow for pair operations consists of the following. You must have Storage Administrator
(Remote Copy) role to perform Continuous Access Journal operations.
•
Check pair status. Each Cnt Ac-J 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 so that the S-VOL again mirrors the on-going, current data in the P-VOL.
•
Delete a pair, which removes the pair relationship from the volumes.
Checking pair status
Every Cnt Ac-J operation requires that pairs have a specific status. Before performing any operation,
check pair status.
•
Find status requirements in the prerequisite information for each operation.
•
To view a pair’s current status in the GUI, or to review status definitions, see “Monitoring pair
activity, status, license capacity” (page 61) .
Creating the Cnt Ac-J initial copy
The pair is created when you create the initial copy. All data in the P-VOL on the primary system
is copied to the S-VOL on the secondary system. The P-VOL remains available to the host for I/O
operations.
Prerequisite information
•
The initial copy must be performed from the primary system.
•
S-VOLs must be offline to all hosts.
•
The primary and secondary systems and remote paths must be defined. See “Configuring
primary and secondary systems for Cnt Ac-J ” (page 55) for more information.
•
Journal volumes must be registered to the journals that are associated with pairs. See “Creating
journals and adding journal volumes ” (page 57) for more information.
•
Make sure to review the information on numbering S-VOL LUNs in the bullet on creating
multiple pairs in
“Planning pair volumes ” (page 23) .
•
If you are creating a Cnt Ac-J pair for delta resync, see “Delta resync configuration ” (page 127) .
•
Make sure Performance Monitor is stopped.
The following additional information may be useful to you before beginning the procedure:
•
You will select the volumes you will pair by the volume’s port, GID, and LUN. Make sure to
have this information available.
•
You will assign master and restore journals to the P-VOL and S-VOL during the operation.
•
You will assign a mirror ID to the pair. This identifies the pair within the journal. A mirror refers
to the pair within the journal.
•
If the mirror ID you will assign to the new pair contains an existing pair or pairs, the new
pair’s volumes must belong to the same primary and secondary systems in the mirror.
Pair operations workflow 43