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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.
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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.
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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
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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.
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IBM SCSI-2 Fast/Wide RAID PCI Adapter
20 NetWare Integration Guide