Seagate ST39173WC Specifications download pdf (Page 34)

2-4 Sun StorEdge A1000 and A3x00/A3500FC Best Practices Guide • November 2002

The total SCSI bus length for this example is 24.4 M. It is calculated as follows: each

SCSI cable’s length (Cable no. 1 + Cable no. 2 + Cable no. 3) + the internal SCSI bus

length of each device (Host no. 1 + A3x00 no. 1 + A3x00 no. 2 + Host no. 2).

FIGURE 2-1 SCSI Bus Length Calculation

Each A3500FC is shipped from the factory with one pair of 15 meter fiber-optic

cables. The product will support a multi-mode fiber-optic connection up to 500

meters long using short wave GBICs only. The use of long wave GBICs is supported

but the connection must be through a switch to the host processor (

FIGURE 2-2). Refer

to the switch documentation for the maximum cable length for the long wave GBIC

connection.

FIGURE 2-2 Fibre Channel Connection With Long Wave GBIC Support

2.1.6 SCSI ID, Loop ID, Controller, and Disk Tray

Switch Settings

The factory default setting for controller A is SCSI ID 5 (T5) and for controller B is

SCSI ID 4 (T4). The SCSI cables connected within a SCSI daisy chain configuration

should be crossed to avoid SCSI ID conflicts (see Section 1.2.2 in the Sun StorEdge

A3500/A3500FC Hardware Configuration Guide).

Host no. 2

Cable no. 1 (8.0 M)

(0.1 M)

(0.1 M) (0.1 M)

(0.1 M)

Cable no. 3 (8.0 M)

A3x00 no. 1

A3x00 no. 2

Host no. 1

Cable no. 2 (8.0 M)

Switch

Host

A3500FC

Short wave GBIC connection (500 M max)

Long wave GBIC connection

Processor

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Seagate ST39173WC Specifications Page 34