Seagate ST336854FC, ST3146954FC manual Dual port support, Fibre Channel Arbitrated Loop options

Models: ST336854FC ST373554FC ST3146954FC

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9.1.10Fibre Channel Arbitrated Loop options

9.1.10Fibre Channel Arbitrated Loop options

Table 15 lists the FC-AL options supported by Cheetah 15K.4 FC drives.

Table 15:

FC-AL options supported

 

 

 

Option

 

Supported

 

 

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

 

 

 

9.2Dual port support

Cheetah 15K.4 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.

Note. When a Cheetah 15K.4 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.4 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 15K.4 FC Product Manual, Rev. B

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Seagate ST336854FC, ST3146954FC, ST373554FC manual Dual port support, Fibre Channel Arbitrated Loop options