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Chapter 4: Subsystem Connection and Operation
Subsystem Connection and Operation 4-19
Data Path Connection
Fault-tolerant data paths
Host Channel Bandwidth
1600 MB/s
Max. Number of Drives
24
The onboard hub can be disabled so that individual host ports provide access to
individual RAID controllers.
• This is a SAN storage application using two (2) host channels through four
(4) separate FC links from individual RAID controllers.
• Path bypass redundancy is provided externally by a fabric switch.
• Depending on switch port configuration, change your FC host-side protocol
through firmware utilities to fit the connection type either to the N_ports or
the NL_ports as specified by your FC switches.
• Access management software can be implemented to direct data flow
through an existing host link if one of the data paths fails. The precondition
is that an array should also be available through the host ID/LUNs on
another host link.
CAUTION!
Figure 3-10: Faulty Connections in a Public Loop
Please DO NOT connect the cascade ports of a single host channel on a
RAID controller to two different FC switches. A public loop contains only one
FL_port, and hence the second FL_port will become non-functional.