Bull Cedoc Bull Escala 2104 TS4, Руководство по установке

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10. Figure 26 shows other switches on the SCSI interface card.
11. The SCSI bus split control
7
controls the SCSI bus mode. When the switch
is off, the enclosure is configured as a single SCSI bus. When this switch is
on, the enclosure is configured as a dual or split SCSI bus.
12. Verify that switch
8
and
9
(reserved) are off.
13. Verify that the disable ID 6 handling switch
10
is off. The SCSI ID 6 is
automatically disabled and removed from the system when the following
conditions are met:
v
The switch is off.
v
Two SCSI interface cards are installed with single-bus configuration.
v
Two hosts are connected to the 2104 Model TS4 and both are on.
When two SCSI interface cards are installed and the 2104 Model TS4 is
configured for single-bus mode, an ID conflict occurs if a drive is installed in
the slot of SCSI ID 6. The ID conflict exists because one of the host bus
adapter (HBA) SCSI IDs should be set to 6 when using both host ports. Unless
the disable ID 6 handling switch is off or the drive is removed from the slot of
SCSI ID 6, there will be an ID conflict between the HBA that is using ID 6 and
the drive in the slot of SCSI ID 6. Removing the drive from slot 6 and replacing
it with a dummy carrier eliminates the conflict.
An alternative is to turn the disable ID 6 handling switch off, which
continuously applies a SCSI RESET signal to the drive in the slot of ID 6 when
TERMPWR is present on both JBOD interface cards. While the drive is held in
RESET, it releases all bus signals, effectively removing it from the system. The
drive in the slot of SCSI ID 6 will continuously remain in RESET under these
conditions until power is removed and the disable SCSI ID 6 handling switch is
on.
SC000208
15
11
16
12
17
13
18
14
7
8
9
10
Figure 26. Card assembly switches
Installing and testing the 2104 Model TS4
15