IBM SG24-4576-00 manual ∙ IBM SCSI-2 Fast/Wide Streaming-RAID Adapter/A

standard 8-bit SCSI devices. Up to seven SCSI physical devices may be attached to this adapter.

This adapter has a dedicated 80C186 local processor on board, which allows it to implement advanced features such as TCQ.

The dual bus design of the adapter prevents access to internal DASD from the external port. It also allows the maximum cable length to be calculated individually for each bus. This allows for additional capability externally.

∙IBM SCSI-2 Fast/Wide Streaming-RAID Adapter/A

This adapter has the same performance advantages of the IBM SCSI-2 Fast/Wide Streaming Adapter/A plus a RAID array controller. This feature offers the additional data protection security inherent in RAID configurations. Also, the adapter microcode is optimized for database and video server environments.

Two independent SCSI buses are available for internal and external array configurations, further enhancing performance and fault tolerant configurations. The dual bus of the adapter allows for a maximum connection of up to 14 drives, seven on each individual bus. One bus cannot support internal and external devices simultaneously.

∙IBM SCSI-2 Fast PCI Adapter

This adapter features a RISC processor which reduces the time the adapter needs to process SCSI commands. It also supports system DMA which reduces the CPU overhead by transferring data into the system memory directly.

It contains two SCSI-II ports, one internal and one external, and supports up to seven SCSI-II fast devices at a 10 MBps data transfer rate. It implements advanced features such as:

−Multi-thread I/O

−Scatter/Gather

−Tagged Command Queueing

−Synchronous and asynchronous Fast SCSI modes

∙IBM SCSI-2 Fast/Wide PCI Adapter

In addition to the features supported with the IBM SCSI-2 Fast PCI Adapter characteristics, the IBM SCSI-2 Fast/Wide Adapter provides a 20 MBps data transfer rate.

It contains three SCSI-II ports:

−One 50-pin 8-bit internal connector

−One 68-pin 16-bit wide internal connector

−One 68-pin 16-bit wide external connector

It can support up to 15 units, on two of the three ports. If you connect external devices to the adapter, you can attach internal SCSI devices to one or the other, but not to both internal SCSI connectors.

∙IBM SCSI-2 Fast/Wide RAID PCI Adapter

20NetWare Integration Guide