Seagate ST3146855FC ユーザーズマニュアル

Cheetah 15K.5 FC Product Manual, Rev. D

53

Table 15 lists the FC-AL options supported by Cheetah 15K.5 FC drives.              

Cheetah 15K.5 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.

When a Cheetah 15K.5 FC 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 15K.5 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.

OPEN Half Duplex

Accepted from another device.

OPEN Full Duplex

Sent to open another device. Accepted from another device.

Private Loop

Yes

Public Loop

Yes

Old Port State

No

Loop Position

Yes

Loop Position Report

Yes