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42
9.1.10
Fibre Channel Arbitrated Loop options
Table 13 lists the FC-AL options supported by Cheetah 18LP FC drives.
Table 13:
FC-AL options supported
Option
OPEN Half Duplex
OPEN Full Duplex
Private Loop
Public Loop
Old Port State
Loop Position
Loop Position Report
9.2
Dual port support
ST318203FC drives have two independent FC-AL ports. These ports may be connected on independent loops
or on the same loop. Port A and Port B may be connected in any order or combination.
• If both ports are connected on independent loops and hard addressing is used, the drive interface address is
selected through the interface connector, both ports will seek the same loop address. If no conflict, both
ports will have the same loop address.
• If both ports are connected in the same loop and hard addressing is used, at least one port will attempt tak-
ing a soft address to prevent an address conflict.
Note.
When a ST318203FC drive is connected in loops with previous Seagate FC drive products:
Barracuda 4LP FC (ST32171FC, ST34371FC, and ST34571FC)
Barracuda 9FC (ST19171FC)
Cheetah 4LP FC (ST34501FC)
Cheetah 9FC (ST19101FC)
the connection of Port A and B for these products must follow the requirements in their product manu-
als.
Subject to buffer availability, the Cheetah 18LP FC drives support:
• Concurrent port transfers—The drive supports receiving transfers on both ports at the same time when the
ports are on independent loops.
• Full duplex—The drive supports sending FCP_Data, FCP_RSP, FCP_XFR_RDY and ELS transfers while
receiving frames on both ports.
Supported
Accepted from another device.
Sent to open another device.
Accepted from another device.
Yes
Yes
No
Yes
Yes
Cheetah 18LP FC Product Manual, Rev. D
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