IBM 8408-44E Site And Hardware Planning page 181

Figure 95. Mode 1 connection of one ESLL or ESLS storage enclosure by using a YO12 cable to a single SAS
adapter
2. Single SAS adapter to two ESLL or ESLS storage enclosures through a mode 1 connection.
v Connection by using 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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