Switching From The Original To The New Storage Subsystem - IBM Midrange System DS4000 Series Hardware Manual

6. Delete any VolumeCopy logical drive pairs.
7. Delete any remote mirror relationships.
8. Delete any host-to-LUN mapping definitions in the original storage subsystem.

7.5.5 Switching from the original to the new storage subsystem

To switch from the original to the new storage subsystem, perform the following steps:
1. Perform one of the following tasks to export arrays, depending on the availability of hot
spare drives and unconfigured drives in the storage subsystem:
– If hot spare drives or unconfigured hard disk drives are installed in the original storage
subsystem, export all of the defined arrays.
– If no hot spare drives or unconfigured hard disk drives are installed in the original
storage subsystem, keep one array on the original storage subsystem and export all
the other arrays. One array must be in the Optimal state for the storage subsystem to
be up and running.
To export an array using the Storage Subsystem Management window, right-click the
name of the array and select Advanced  Maintenance  Export Array, and follow the
instructions in the window that opens. You can also use the Start Array <array name>
Export command in the IBM Storage Manager Client script window.
2. Power off the original controller enclosure first, and then power off the drive expansion
enclosures. This is the best practice power-off sequence. See the documentation that
comes with the storage subsystem for details about the power-off sequence.
Note: The controller enclosure must powered off before the drive expansion enclosure.
3. Label all the cables connected to the original storage subsystem enclosure.
4. Wait until the LEDs on the storage subsystem chassis are off, and then disconnect all
cables from the storage subsystem chassis.
5. Remove the original storage subsystem enclosure from the rack.
6. Install the new storage subsystem enclosure in the rack.
7. If the original storage subsystem is a DS4700 storage subsystem, install an EXP5000
drive expansion enclosure and move the hard disk drives from the original storage
subsystem to the drive expansion enclosure.
8. Insert the SFPs into the new storage subsystem drive loop/channel port bays and cable
the drive expansion enclosures to the new storage subsystem using the cabling layout you
defined in 7.5.1, "Planning the upgrade" on page 388.
9. Insert the SFPs into the new storage subsystem host port bays and cable the host
interface ports and the storage subsystem management ports of the new storage
subsystem enclosure.
10.Make sure that all of the storage expansion enclosures are set to the same speed for each
drive channel/loop.
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Note: An error occurs if you try to export the last defined array in a storage
subsystem configuration and no hot spare drives or unconfigured drives are
installed.