Drive Channel Cabling Rules - IBM System Storage DS3500 Introduction And Implementation Manual

Draft Document for Review March 28, 2011 12:24 pm
component in the drive channel fails, the DS3500 controllers can still access the EXP3500
expansion enclosures in the redundant drive-channel pair.
Attention: The EXP3500 ships with one ESM installed. If you are going to attach the
EXP3500 to a dual controller DS3500 storage subsystem then you must install a second
ESM in the EXP3500 expansion enclosure to provide redundant drive paths to the
EXP3500 enclosures. Connecting an EXP3500 with one ESM installed to a DS3500 with
two controllers installed is not a supported configuration.

4.6.2 Drive channel cabling rules

You should always follow these two basic connection rules when attaching EXP3500
enclosures to a DS3500 storage subsystem:
Connect the drive expansion SAS port on the DS3500 controller to the SAS IN port on the
EXP3500.
Connect the SAS OUT port on the EXP3500 to the SAS IN port on the next EXP3500.
Chapter 4. IBM System Storage DS3500 and EXP3500 Cabling
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