IBM Ultra320 - Manual (Page 16)

Determining Your Cable Requirements
You must use the correct SCSI cables to properly attach SCSI hard disk drives and subsystems.
If you install an Ultra320 SCSI hard disk drive or subsystem that can transfer data at up to 320 MB/s, the
maximum cable length is limited to 20 meters (approximately 60 feet).
For more information about connecting SCSI hard disk drives to the PCI-X Dual Channel Ultra320 SCSI
RAID Adapter, see Appendix C, “Connecting SCSI Hard Disk Drives to the Adapter,” on page 35 and refer
to the PCI-X SCSI RAID Controller Reference Guide for AIX, order number SA23-1323 or PCI-X SCSI
RAID Controller Reference Guide for Linux, order number SA23-1327.
Internal Cabling
If you plan to install internal SCSI hard disk drives, you must obtain the necessary cables for your system
unit. Refer to your system unit documentation for information about installing internal SCSI backplanes,
hard disk drives, and cables.
A SCSI terminator must be located at the end of the internal cable. Terminators are built into the
backplane within the computer.
External Cabling
External SCSI hard disk drives and subsystems have a variety of connectors. Ensure that you have cables
with the correct connectors for each planned external SCSI attachment.
To externally attach hard disk drives and subsystems to the PCI-X Dual Channel Ultra320 SCSI RAID
Adapter, you may need a 68-pin SCSI Very High Density Connector Interface to standard 68-pin SCSI
standard connector interposer cable. In most cases, the cabling is delivered with the attaching subsystem.
4 PCI-X Dual Channel Ultra320 SCSI RAID Adapter: Installation and Using Guide