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1. Follow the instructions in the Installation, User's, and Maintenance Guide for
2. Select a cabling topology appropriate for the number of storage expansion
3. After you select the cabling topology for your configuration, follow the cabling
4. If required, set unique enclosure IDs for all storage expansion enclosures that
The DS4200 Express Storage Subsystem locates the drives in the storage
expansion enclosures after you power on the configuration. Always connect power
to the storage expansion enclosures first and then connect power to the DS4200
Express. After you have powered on the configuration, use the DS4000 Storage
Manager client to check the status of the new drives, correct any errors found, and
configure the new drives.
DS4200 Express Storage Subsystem drive cabling topologies
This section provides preferred cabling topologies for cabling storage expansion
enclosures to the DS4200 Express Storage Subsystem. The cabling topologies
include the following:
v "One DS4200 Express and one storage expansion enclosure" on page 58
v "One DS4200 Express and two storage expansion enclosures" on page 59
v "One DS4200 Express and three storage expansion enclosures" on page 61
v "One DS4200 Express and four storage expansion enclosures" on page 61
v "One DS4200 Express and up to six storage expansion enclosures" on page 61
Each example provides redundant paths to the drives. If one of these examples is
suitable for your hardware and application, complete the cabling connections as
described by the graphics. If you have hardware other than what is shown in these
examples to include in your topology, use these examples as a starting point for
creating your specific topology.
your DS4000 storage expansion enclosure to set up and mount the storage
expansion enclosures.
Note: Currently, the only DS4000 drive expansion enclosures that can be
attached to the DS4200 Express Storage Subsystem are EXP420s.
Contact your IBM reseller or representatives for other supported storage
expansion enclosures in the future. You can also check the
interoperability matrix at the following Web site:
www.ibm.com/servers/storage/disk/ds4000/interop-matrix.html
enclosures you will connect to the DS4200 Express. If you are connecting
external storage expansion enclosures to the DS4200 Express, ensure that the
storage expansion enclosures are populated with at least two drives before you
power them on. In addition, you must have at least two drives in the DS4200
Express Storage Subsystem before you power it on.
"DS4200 Express Storage Subsystem drive cabling topologies" describes the
recommended schemes for cabling different numbers of storage expansion
enclosures to the DS4200 Express and to each other (if you are connecting
more than one storage expansion enclosure).
diagram for your chosen topology and perform the steps identified in "DS4200
Express Storage Subsystem and supported storage expansion enclosure drive
cabling schemes" on page 63.
are cabled to the DS4200 Express.
Note: The initial release of the DS4200 Express supports EXP420 storage
expansion enclosures only. The enclosure ID on the EXP420 is
automatically set by the controller so you do not have to manually set it.
Chapter 3. Cabling the storage subsystem
57
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