IntraServer Technology ITI-90-100250 - Manual (Page 29)

Page 29 of 83
Connecting Internal SCSI
Devices
Internal SCSI devices (disks inside the host enclosure) can be connected to
the ITI-8241C-R rear I/O adapter using a multi-conductor 68 position ribbon
cable for 16-bit (WIDE) devices. There is one 68 position connector for each
of the two SCSI buses. SCSI bus A is wired to J7 and SCSI bus B is wired to
J8.
Connectors that are labeled ULTRA2 LVD/SE are capable of running LVD
SCSI at 80MB/sec. To maximize the performance of the card, use all LVD
capable devices. Connecting a non-LVD device to the LVD bus will cause it
to run in SE mode and reduce the maximum performance of the port to
40MB/sec.
If the SCSI bus is not in LVD mode (LVD LED is off), the SCSI bus length
must be kept to the Ultra2 SE length of 1.5 meters.
NOTE: If the LVD LED is not illuminated, the LVD bus is not running in
LVD mode. This is a quick check to indicate if a non-Ultra2/LVD
device is on the LVD segment of the card.
Attaching Ultra2 LVD Devices
A differential internal cable (50-401030) can be used to attach internal LVD
disks to the ITI-8241C-R rear I/O module. The LVD cable should be
plugged into one of the LVD/SE connectors on the rear I/O adapter (J7 or J8).
All internal LVD devices should be connected to this cable.
To configure internal devices on the LVD/SE bus:
•
Set the device to a unique SCSI ID (0-6 or 8-15), the host adapter
default is 7.
•
Plug the unterminated end of the SCSI cable into the IntraServer
CompactPCI
®
adapter, making sure pin 1 (usually marked on the
cable with a red stripe), corresponds to pin 1 on the connector.
•
Plug one connector on the ribbon cable to each of the devices on
the bus
•
Plug a 4-pin power connector into the power connector of each
SCSI device
•
The end of the LVD differential cable has a built in LVD
terminator, which will correctly terminate the end of the internal