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drive (it had previously been selected as boot drive because it has the lowest drive number,

that is, 0, and is therefore the first drive to be communicated to the system ).

Target ID and LUN of "

Not Direct Access Devices

" (devices such as streamers, tapes, CD-

ROMS, etc., not configurable with GDTSETUP) are determined on the basis of the SCSI-ID

and the SCSI channel used by the ICP Controller. These devices can only be configured with

SCSI-IDs 2 to 6. SCSI-ID 0 and 1 are reserved for hard disks, SCSI-ID 7 for the ICP Controller.

If "Not Direct Access Devices" are configured on SCSI-ID 0 or 1, they are not recognized du-

ring the scanning process and can therefore not be used. The Target IDs of Not Direct Access

Devices are identical to their SCSI-ID, the LUN depends on the SCSI channel used (LUN 0 for

SCSI channel A and LUN 4 for SCSI channel B). Note: After a cold boot the GDT BIOS dis-

plays all connected devices with their physical coordinates, i. e. their SCSI-ID and SCSI-

LUN, (see "Chapter B, ICP Controller Function Check").

6&6,,'RI1RW'LUHFW$FFHVV

'HYLFHV

8VHG*'7

6&6,FKDQQHO

81,;

7DUJHW,'

81,;

/81

2A20

3A30

4A40

5A50

6A60

2B24

3B34

4B44

5B54

6B64

Having to determine the Target ID and LUN in such a complicated manner might seem rat-

her awkward. However, it is necessary to do so because the ICP Controllers have more than

one SCSI channel, whereas UNIX can only manage host adapters with one SCSI channel.

Therefore, the GDT UNIX driver has to make the appropriate transformations.

&RQILJXUDWLRQ([DPSOH

In the PCI computer are two ICP Controllers (HA 0 = 1st GDT, HA 1 = 2nd GDT), each with

two SCSI channels.

1 hard disk as Host Drive no. 0 on HA0

1 hard disk as Host Drive no. 0 on HA1

1 hard disk as Host Drive no. 1 on HA1

1 Streamer SCSI-ID 2, LUN 0 on SCSI channel A of HA0

1 CD-ROM SCSI-ID 3, LUN 0 on SCSI channel A of HA0

1 DAT SCSI-ID 2, LUN 0 on SCSI channel B of HA1

5HVXOW

HA Target-ID LUN Device

0001

hard disk, Host Drive no. 0 (boot- and

installation drive)

0 2 0 Streamer

030CD-ROM

1 0 0 hard disk, Host Drive no. 0

1 0 1 hard disk, Host Drive no. 1

124DAT

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 92 93

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