Fibre Channel Arbitrated Loop Options; Dual Port Support - Seagate Cheetah NS 10K Product Manual

9.1.10

Fibre Channel Arbitrated Loop options

Table 14 lists the FC-AL options supported by Cheetah NS FC drives.
Table 14: 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

Cheetah NS FC 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.
Subject to buffer availability, the Cheetah NS 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.
Cheetah NS FC Product Manual, Rev. A
Supported
Accepted from another device.
Sent to open another device. Accepted from another device.
Yes
Yes
No
Yes
Yes
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