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Example: If a host-drive no. 13 exists (target-ID=1, LUN=5), there also has to be a host-drive
with number 8 (target-ID=1, LUN=0). Please keep this in mind when assigning the numbers
in GDTSETUP. Target ID and LUN of "
Not Direct Access Devices
" (devices such as stream-
ers, tapes, CD-ROMS, etc., not configurable with GDTSETUP) must be 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 during the scanning process and can therefore not be used. The Target
IDs of
Not Direct Access Devices
are identical to their SCSI-IDs, 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 displays all connected devices with their physical coordinates, i.e., their
SCSI-ID and SCSI-LUN, (see "Chapter B, ICP Controller Function Check").
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'HYLFHV
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2
A
2
0
3
A
3
0
4
A
4
0
5
A
5
0
6
A
6
0
2
B
2
4
3
B
3
4
4
B
4
4
5
B
5
4
6
B
6
4
Having to determine the Target ID and LUN in such a complicated manner might seem
rather 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 chan-
nel. Therefore, the GDT UNIX driver has to make the appropriate transformations.
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In the PCI computer are two ICP Controllers (HA 0 = 1st GDT, HA 1 = 2nd GDT), each having
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
0
0
0
1st hard disk, Host Drive no. 0 (boot- and
installation drive)
0
2
0
Streamer
0
3
0
CD-ROM
1
0
0
hard disk, Host Drive no. 0
1
0
1
hard disk, Host Drive no. 1
1
2
4
DAT
