IBM DS5100 Installation, User's, And Maintenance Manual page 40

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Figure 2. Location of components in the storage subsystem
The storage subsystem provides flexibility in configuring a RAID array. A minimal
storage subsystem configuration would consist of one DS5100 and DS5300 and
one storage expansion enclosure. The storage expansion enclosure can contain as
few as two disk drives. The maximum number of disk drives a DS5100 and DS5300
can support is listed in "Features at a glance" on page 2.
Currently, the DS5100 and DS5300 supports the EXP5000 and EXP5060 storage
expansion enclosures.
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IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User's, and Maintenance Guide
Interconnect-
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RAID controllers