User`s guide

9-1
9
Connecting SCSI and RAID Adapters
Introduction
This chapter contains the configuration guidelines that must be followed
when connecting SCSI or RAID adapters to optional disk and tape drives.
SCSI Configuration Guidelines
• Fast and wide SCSI supports up to 16 devices per channel.
• Narrow devices on a wide cable count as two SCSI IDs. For
example, the narrow CD-ROM drive SCSI ID is 4 so SCSI ID 12 is
no longer available. The narrow CD-ROM device counts as two
devices on a
16-bit wide data path.
• When a narrow SCSI adapter is installed, the narrow SCSI bus
only supports up to eight SCSI devices.
• Select the disk drives in the SBB bays for hot-swap support in a
RAID server.
• Do not connect wide SCSI devices to a narrow SCSI adapter.
• Run the SCSI and/or RAID configuration utility to change host
adapter settings to fit your specific configuration.
Refer to Chapter 7 for additional SCSI configuration guidelines.