IBM 8408-44E Site And Hardware Planning page 165

Figure 79. Mode 1 connection of a 5887 enclosure by using YO cables to dual SAS adapters
4. Dual FC 5901 or FC 5278 adapters to two 5887 enclosures via a mode 1 connection.
v 5887 enclosures with two sets of 24 hard disk drives (HDDs).
v Connection using dual SAS YO cables to connect to the 5887 enclosure.
v Supported only on AIX and Linux systems.
5. Two single 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 two SAS YO 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.
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