Huawei OceanStor Dorado5000 V3 - Page 10

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 A SAS port can only connect to one disk enclosure.
 Each controller connects to port P0 of a disk enclosure via one cable. That is, each controller enclosure
connects to a disk enclosure via two cables.
Controller enclosure
Connecting SAS disk enclosures to Dorado3000 V3 and Dorado5000 V3 Enhanced Edition (SAS)