IBM System Storage DCS Series Installation And Migration Manual page 48

To connect the DCS3700 storage system with Gen2 controllers RAID controllers A
and B to multiple DCS3700 expansion enclosures, complete the following steps:
1. Connect the DCS3700 expansion enclosure to controller A:
2. Connect the SAS cable of the DCS3700 expansion enclosure to the next
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IBM System Storage DCS Series with Gen2 controllers Hard Disk Drive and Storage Enclosure Installation and Migration
Guide
a. Connect one end of a SAS cable to the drive expansion port on controller A.
b. Connect the other end of the SAS cable to one of the In ( ) SAS connectors
on the ESM in SBB slot A in the DCS3700 expansion enclosure.
DCS3700 expansion enclosure in the chain:
a. Connect one end of a SAS cable to the Out ( ) SAS connector on the ESM in
SBB slot A of the DCS3700 expansion enclosure that you connected.
b. Connect the other end of the SAS cable to one of the In ( ) SAS connectors
on the ESM in SBB slot A in the next DCS3700 expansion enclosure in the
chain.