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 consists of the following:
Check pair status. Each operation requires a pair to have a specific status. You also check
pair status to insure than an operation completed successfully.
Create the pair, in which the S-VOL becomes a duplicate of the P-VOL. With Business Copy,
you have the option for creating the pair and immediately splitting it in order to access the
S-VOL.
Split the pair, which separates the primary and secondary volumes and allows use of S-VOL
data by secondary applications.
Re-synchronize the pair, in which the S-VOL is again updated from the P-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
When you have L2 pairs, besides checking pair status, you will also check whether an operation
is possible given the status of related L1 and L2 pairs. For information, see
permitted for L1, L2 pairs " (page

Create pairs

When you create the initial copy, data in the P-VOL is copied to the S-VOL. During the operation,
the P-VOL can receive updates from the host. When the initial copy is completed, the updated data
in the P-VOL—differential data—is copied to the S-VOL periodically (update copy).
Business Copy provides an option for creating the pair and immediately splitting it, for instant
access the S-VOL. If you are interested in this operation, see
for instructions.
You can create pairs for L1 or L2. Instructions for both procedures are included in this section.
Prerequisite Information
Make sure that your volumes are set up for pairing. See
for details.
When the P-VOL is used with another pair, the pair status of the existing pairs must be PAIR.
When the P-VOL is not used with another pair, both P-VOL and S-VOL must be in SMPL status.
36).
37).
"Split, create and pairs" (page 27)
"Planning pair volumes" (page 11)
"Monitoring the system
"Operations
Pair operations workflow 25