IBM 8408-44E Site And Hardware Planning page 166

Figure 80. Mode 2 connection of a 5887 enclosure by using YO cables to two single SAS adapters
6. Two pairs of dual FC 5901 or FC 5278 adapters to one 5887 enclosure via a mode 2 connection.
v 5887 enclosure with two sets of 12 hard disk drives (HDDs).
v Connection using dual SAS X cables to connect to the 5887 enclosure.
v Each pair of FC 5901 adapters controls half of the 5887 enclosure.
v Supported only on AIX and Linux systems.
150
Site and hardware planning