Migrating data

True Copy for Mainframe User Guide for VSP One Block 85
Version
10.5.x
File Size
2745 KB
Audience
anonymous
Part Number
MK-26VSP1B036-02
ft:lastEdition
2026-06-23

You typically migrate data to copy data to a new volume, to temporarily move data from a volume to accommodate other activities (for example, to make repairs), or to relocate volumes in order to balance workloads and distribute I/O activity evenly within or across storage systems.

  1. Make sure that the data path is installed and TrueCopy for Mainframe configuration procedures are completed.
  2. Verify that the target volume (S-VOL) is offline from all attached hosts.
    The source volume (P-VOL) can remain online.
  3. Connect to the storage system that contains the volume to be migrated.
    Add a remote connection in the storage system that contains the volume to be migrated.
  4. Create a TrueCopy for Mainframe pair.
  5. Monitor the progress of the initial copy operation and the status of the pair. When the pair status changes to Duplex, the operation has been completed.
  6. Use the IBM® P/DAS host software function to redirect all application I/Os to the S-VOLs nondisruptively.
    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 primary storage system, select the correct CU, and release the TCz 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 VOLSER 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 TCz pairs in the reverse direction. If the original P-VOLs will be temporarily unavailable for update copy operations, you can suspend the new pairs so that the new primary storage system keeps track of changes.
    6. Start the applications with the S-VOLs. When the original P-VOLs become available, you can resynchronize the pairs.
    If the original P-VOL is temporarily unavailable for update copy operations, split the new pair so that the new primary storage system keeps track of changes.
    CFW data is not migrated when you set the CFW data option to Disabled. Note that there is a possibility that I/O will terminate abnormally if you access the corresponding dataset when you use the S-VOL after migrating data.