Installation; Drive Id/Option Selection; Led Connections; Figure 5. Physical Interface - Seagate Cheetah 18FC ST118202FC Product Manual

Disc drive

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Cheetah 18FC Product Manual, Rev. C

8.0

Installation

Cheetah 18FC disc drive installation is a plug-and-play process. There are no jumpers, switches, or termina-

tors on the drive. Simply plug the drive into the host's 40-pin Fibre Channel backpanel connector (FC-SCA)

no cables are required. See Section 9.5 for additional information about this connector.

Use the FC-AL interface to select drive ID and all option configurations for devices on the loop.

If multiple devices are on the same FC-AL and physical addresses are used, set the device selection IDs (SEL

IDs) on the backpanel so that no two devices have the same selection ID. This is called the hard assigned arbi-

trated loop physical address (AL_PA). There are 125 AL_PAs available (see Table 21 on page 52). If you set

the AL_PA on the backpanel to any value other than 0, the device plugged into the backpanel's SCA connector

inherits this AL_PA. In the event you don't successfully assign unique hard addresses (and therefore have

duplicate selection IDs assigned to two or more devices), the FC-AL generates a message indicating this con-

dition. If you set the AL_PA on the backpanel to a value of 0, the system issues a unique soft-assigned physical

address automatically.

Loop initialization is the process used to verify or obtain an address. The loop initialization process is per-

formed when power is applied to the drive, when a device is added or removed from the Fibre Channel loop, or

when a device times out attempting to win arbitration.

• Set all option selections in the connector prior to applying power to the drive. If you change options after

applying power to the drive, recycle the drive power to activate the new settings.

• It is not necessary to low-level format this drive. The drive is shipped from the factory low-level formatted in

512-byte logical blocks. You need to reformat the drive only if you want to select a different logical block size.

8.1

All drive options are made through the interface connector (J1). Table 18 on page 48 provides the pin descrip-

tions for the 40-pin Fibre Channel single connector (J1).

8.2

A connector, J6, is provided on the printed circuit board assembly (PCBA) to provide port bypass, drive active,

and drive fault LED connections (see Figure 6 on page 28). See Sections 9.5.7, 9.5.8, and 9.5.9 for descrip-

tions of LED functions.

Figure 5.

Physical interface

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