The document discusses two types of SCSI: parallel SCSI, which offers high bandwidth but has limitations in distance, number of devices, and bandwidth when multiple devices are connected, and serial SCSI, which follows a layered architecture and includes protocols like Fiber Channel, Fire Wire, and SSA. Fiber Channel allows connection of up to 127 devices but is hindered by high costs, limited distance, and interoperability issues. Both types are considered based on specific use cases such as workstations or small servers.

1. 1) Parallel SCSI:
- Parallel SCSI bus gives very High Bandwidth.
- Limitation of Parallel SCSI:
Limitations of
Parallel SCSI
Restrictive
Distance
Capability (few
meters only)
No. of
Connected
Devices (8-16)
Bandwidth
Limitations
when more than
1 device
Acceptable
considering a
Workstation or
small server

2. 2) Serial SCSI:
- SCSI Architecture Model (SAM) defines a Layered Model.
- Serial SCSI Protocols were:
1) Fiber Channel
2) Fire Wire
3) SSA
1) Fiber Channel:
-Provides Point to Point connectivity
- Connect up to 127 devices
- Fiber Channel Limitations:
Limitations of
FC
Price is too high
Limited Distance
(10-50 km)
Interoperability
Another Network to
maintain