IBM 8408-44E Site And Hardware Planning page 183

Figure 97. Mode 1 connection of one ESLL or ESLS storage enclosure by using YO12 cables to one pair of SAS
adapters
4. One pair of SAS adapters to two ESLL or ESLS storage enclosures through a mode 1 connection.
v For SAS adapter pairs, you must attach the cables to the same port on both adapters.
v Connection by using dual SAS YO12 cables to connect to the ESLL or ESLS storage enclosure.
v Supported on AIX, Linux, and IBM i systems.
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