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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
3.2.2 Connecting a SCSI Array
The SCSI Diamond-VT uses a VHDCI connector and SCSI cables to connect to a host. It automatically
detects the type of Host Interface Card it is using without any intervention.
To connect the SCSI Diamond-VT
1 Insert a SCSI VHDCI connector into the Host
Interface Card in the back of the Diamond-VT.
2 If the SCSI Diamond-VT is the last device on
the bus, you must attach a VHDCI terminator to
one connector of the SCSI Host Interface Card
or connect a cable between the second
connector and the next device on the SCSI bus.
3 The SCSI Host Interface Card has a rotary
binary-coded hex switch which allows you to
set the SCSI ID of the HIC. Be sure the selected
ID is different from all other SCSI devices on
the bus.
Note
If slower devices are connected on the same
SCSI bus as the Ultra 160 Diamond-VT, the
bus communicates at the rate of the slowest
device.
Exhibit 3.2-1 SCSI cable options.
Exhibit 3.2-2SCSI interface cards: left without terminators attached; right with a terminator attached.
Bus speed, MB/sec.
max.
Bus width,
bits
Max. bus lengths,
meters
Max. device
support
Single-ended LVD
SCSI-1 5 8 6 - 8
Fast SCSI 10 8 6 - 8
Fast Wide SCSI 20 16 6 - 16
Wide Ultra SCSI 40 16 3 - 4
Wide Ultra SCSI 40 16 1.5 - 8
Wide Ultra 2 SCSI 80 16 - 12 16
Ultra 3 or Ultra160 SCSI 160 16 - 12 16