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120 RS/6000 43P 7043 Models 150 and 260 Handbook
Table 28. Comparing SSA and SCSI
4.6 Internal SCSI Devices
The following section gives an overview of the internal SCSI devices for the
Models 150 and 260, and their main characteristics:
• Disk drives
• CD-ROM drives
• Tape drives
4.6.1 Disk Drives for the Model 150 and Model 260
Table 29 on page 121 shows the main characteristics of the internal disk
drives that are available for the Models 150 and 260. When you want to install
a 4.5 GB (# 2900) or a 9.1 GB (# 2908) hard disk in bay 3 you have to use the
Media Bay Disk Drive Mounting Kit (# 6509).
If you want to install the disk drives in bay 4 or 5, you have to use either the
4.5 GB (# 3028) or the 9.1 GB (# 3029) hard disk.
Feature SCSI SSA
Cable Type 68 conductor shielded
cable (SCSI-II Differential
Fast/Wide)
4 conductor twisted-pair
Maximum Cable Lengths 25 Meters Total 25 meters between devices,
Up to 2500 Meters between
devices with the use of a
Fiber Optic Extender
Cable Costs Significant Low
Individual drive addressing Must be set manually Dynamic
Cable Termination Electrical terminator
must be at the end of the
SCSI-bus
No termination required,
closed serial loops
Fault Tolerance If single data path (bus) is
compromised, access is
lost
No single point of failure.
Multiple data paths prevents
a single loop from causing
loss of access to information
Maximum Throughput Up to 40 MB/s Up to 160 MB/s