Fujitsu ETERNUS AX Series Installation And Cabling Manual page 38

HX2000 controller 0b and 0a port connection rules to external disk shelves
The HX2000 have a unique set of connection rules because each controller must maintain same domain
connectivity between the internal storage (port 0b) and the stack. This means that when a controller is
located in slot A of the chassis (controller 1) it is in domain A (IOM A) and therefore port 0b must connect to
IOM A in the stack. When a controller is located in slot B of the chassis (controller 2) it is in domain B (IOM B)
and therefore port 0b must connect to IOM B in the stack.
Note: If you do not connect the 0b port to the correct domain (cross-connect domains), you expose your
system to resiliency issues that prevent you from performing nondisruptive procedures safely.
• Controller 0b port (internal storage port):
• Controller 1 0b port always connects to IOM A (domain A).
• Controller 2 0b port always connects to IOM B (domain B).
• Port 0b is always the primary path.
• Port 0b always connects to the logical last disk shelf in a stack.
• Port 0b always connect to disk shelf IOM port 3.
• Controller 0a port (internal HBA port):
• Controller 1 0a port always connects to IOM B (domain B).
• Controller 2 0a port always connects to IOM A (domain A).
• Port 0a is always the secondary path.
• Port 0a always connects to the logical first disk shelf in a stack.
• Port 0a always connect to disk shelf IOM port 1.
The following illustration highlights internal storage port (0b) domain connectivity for a HX2000 multipath HA
configuration:
| SAS cabling rules |
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