6 pair operations, Pair operations workflow, Checking pair status – HP XP P9500 Storage User Manual
Page 56: Creating pairs
6 Pair operations
This chapter provides instructions for performing Continuous Access Synchronous pair operations.
Pair operations workflow
Basic Continuous Access Synchronous operations consist of the following tasks.
•
Check prerequisites for each procedure.
•
Always check pair status. Each Continuous Access Synchronous operation requires the pair
to be in a specific status.
•
Create a pair, in which the S-VOL becomes a duplicate of the P-VOL.
•
Split a pair, which separates the P-VOL and S-VOL and allows read/write access to the S-VOL
if desired.
•
Re-synchronize a pair, in which the S-VOL again mirrors the on-going, current data in the
P-VOL.
•
Release a pair.
NOTE:
In order to perform pair operations or check the pair status, LU paths must be established.
If you intend to perform storage or replication management operations, make sure that pairs are
deleted before removing LU path definitions.
NOTE:
Pair operations cannot be performed when changing the microcode, nor if microcode
changes are cancelled. If you start a microcode change, make sure it completes before performing
pair operations.
Disaster recovery procedures are discussed in
Checking pair status
Every Continuous Access Synchronous operation requires that the pairs have a specific status.
Before performing any operation, check pair status.
•
Find status requirements under the prerequisite information for each operation.
•
To view a pair’s current status in the GUI, or review status definitions, see
.
Creating pairs
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.
information about External Storage Access Manager pairs also displays in the Pair Operation
window. See the HP XP P9000 External Storage Access Manager User Guide for information.
Prerequisite information
•
The initial copy is performed from the primary system.
•
S-VOLs must be offline to all hosts.
•
You will select the primary and secondary volumes to be paired by individual volume’s port,
GID, and LUN CU and/or LDEV numbers. You should have this information on hand.
•
Ports must be configured for Continuous Access Synchronous. See
for more information.
•
The primary and secondary system must be configured for Continuous Access Synchronous.
See
Configuring storage systems, defining logical paths (page 48)
for more information.
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Pair operations