IBM 8408-44E Site And Hardware Planning page 187

Figure 101. Mode 2 connection of one ESLL or ESLS storage enclosure by using X12 cables to two pairs of SAS
adapters
8. Four independent SAS adapters to one ESLL or ESLS storage enclosure through a mode 4 connection.
v For SAS adapter pairs, you must attach the cables to the same port on both adapters.
v Connection by using SAS X12 cables to connect to the ESLL or ESLS storage enclosure.
v Supported only on AIX and Linux systems.
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