Performing Pair Operations; Pair Operations Workflow; Check Pair Status; Create Pairs - HP StorageWorks P9000 User Manual

5 Performing pair operations

This chapter provides instructions for performing pair operations using Remote Web Console.

Pair operations workflow

A typical operations workflow follows:
Check pair status. Each operation requires a pair to have a specific status. You also check
pair status to insure that an operation completed successfully.
Create the pair in which the T-VOL becomes a duplicate of the S-VOL. With Business Copy
Z, you have the option for creating the pair and immediately splitting it in order to access the
T-VOL.
Split the pair, which separates the source and target volumes and allows use of T-VOL data
by secondary applications.
Resynchronize the pair in which the T-VOL is again updated from the S-VOL.
Delete the pair in which the pair relationship between the pair volumes is ended, though data
in the pair volumes remains.

Check pair status

Every pair operation requires the pair to have a specific status. When you want to perform a pair
operation, check pair status to insure that you can proceed successfully.
For pair status definitions and instructions for finding pair status, see
(page 40).
For the operations allowed for specific pair statuses, see

Create pairs

When you create the initial copy, data in the S-VOL is copied to the T-VOL. During the operation,
the S-VOL can receive updates from the host. When the initial copy is completed, the updated data
in the S-VOL—differential data—is copied to the T-VOL periodically (update copy).
Business Copy Z provides an option for creating the pair and immediately splitting it, for instant
access the T-VOL. If you are interested in this operation, see
for instructions.
Prerequisite information
Make sure that your volumes are set up for pairing. See
for details.
When the S-VOL is used with another pair, the pair status of the existing pairs must be Duplex.
When the S-VOL is not used with another pair, both S-VOL and T-VOL must be in Simplex
status.
28 Performing pair operations
"Monitoring the system"
Table 8 (page 42).
" Split and create pairs" (page 30)
"Planning pair volumes" (page 11)