HP XP P9000 Continuous Access Synchronous for Mainframe Systems User Guide

7 Data migration
This chapter discusses using Continuous Access Synchronous Z to migrate data from one storage
system to another.
Migration overview
Continuous Access Synchronous Z can be used to move data from one system to another. Data is
typically migrated for the following reasons:
• To load data onto new or scratch volumes (for example, to a new or upgraded storage system).
• To temporarily move data from an LDEV to accommodate other activities (for example, to
make repairs).
• To relocate LDEVs in order to balance workloads and distribute I/O activity evenly within or
across storage systems.
Continuous Access Synchronous Z operations within one P9500 can only be performed if the
Business Copy Z license is not installed in the storage system. If you are migrating data between
storage systems using P/DAS, both storage systems must be the same type (P9500).
In a data migration, the entire contents of a volume are copied to the second volume (P-VOL to
S-VOL). The volumes are identical when the copy operation completes. The volumes are then usually
released from the Continuous Access Synchronous Z pair.
If you need to migrate data from another vendors’ storage systems to a P9500 system, contact
your HP account team as Continuous Access Synchronous Z cannot be used in this case.
Migrating data
1. Make sure that the data path is installed, and Continuous Access Synchronous Z configuration
procedures are completed. See “Configuration” (page 57) for details.
2. Vary the target volume (S-VOL) offline from all attached hosts. The source volume (P-VOL) can
remain online.
3. In Remote Web Console, connect to the storage system where the volume to be migrated is
located. Create the Continuous Access Synchronous Z pair or pairs. See “Creating pairs”
(page 66) as needed.
When pair status changes to Duplex, the operation is completed. You can monitor the progress
of the operation from the Pair Operations window.
4. Use the IBM P/DAS host software function to redirect all application I/Os to the S-VOLs non
disruptively. If the host system does not support P/DAS, use the following procedure to stop
using the P-VOLs and switch to the S-VOLs:
1. Quiesce all applications using the P-VOLs.
2. When all update activity to the P-VOLs has stopped, connect to the MCU, select the correct
CU, and release the Cnt Ac-S Z pairs.
3. If the P-VOLs and S-VOLs are attached to the same host, vary the P-VOLs offline first, and
then vary the S-VOLs online. The P-VOLs and S-VOLs have the same VOLSERs and cannot
be online to the same hosts at the same time.
4. If an S-VOL contains more cylinders than its P-VOL, update the S-VOL volume table of
contents (VTOC) using ICKDSF/REFORMAT.
5. If you want to keep the volumes synchronized, establish the same Cnt Ac-S Z pairs in the
reverse direction using the No Copy initial copy option. If the original P-VOLs will be
temporarily unavailable for update copy operations, you can suspend the new pairs so
that the new MCU keeps track of changes.
6. Start the applications with the S-VOLs. When the original P-VOLs become available, you
can resynchronize the pairs using the Resume Pair dialog box.
72 Data migration