HP XP7 Continuous Access Synchronous for Mainframe Systems User Guide (TK911-96003)
6 Cnt Ac-S Z pair operations
This chapter provides instructions for performing Continuous Access Synchronous Z pair operations.
Pair operations workflow
You must have Storage Administrator (Remote Copy) role to perform Continuous Access Synchronous
Z operations.
Basic Continuous Access Synchronous Z operations consist of the following operations.
• Check prerequisites for each procedure.
• Always check pair status. Each Continuous Access Synchronous Z 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.
• Resynchronize a pair, in which the S-VOL again mirrors the on-going, current data in the
P-VOL.
• Delete a pair.
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 “Disaster recovery” (page 95).
Checking pair status
Every Continuous Access Synchronous Z 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 “Monitoring pair
status, license capacity” (page 74).
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.
Prerequisite information
• The initial copy is performed from the primary system.
• S-VOLs must be offline to all hosts.
• Ports must be configured for Continuous Access Synchronous Z. See “Defining port attributes”
(page 59) for more information.
• The primary and secondary system must be configured for Continuous Access Synchronous
Z. See “Setting up primary and secondary systems for Cnt Ac-S Z” (page 60) for more
information.
• Stop Performance Monitor before the initial copy to avoid overloading with TCP/IP traffic.
• During this operation, you select P-VOLs and S-VOLs by CU and/or LDEV numbers.
66 Cnt Ac-S Z pair operations