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KZPSA PCI-to-SCSI Storage Adapter
2–4 EK–KZPSA–UG. B01
2.5 SCSI Termination Power
It is normal for adapters, not devices, to supply termination power to the SCSI
bus. The KZPSA adapter is configured at the factory to supply 1.5 amps of ter-
mination current. Although each SCSI node may supply termination power to the
bus, a single source from the host adapter is sufficient. No more than four
sources of termination power on a SCSI bus is recommended.
2.6 SCSI Fast Data Transfers
Eight-bit devices that allow fast data transfers will transfer data at rates greater
than 5 Mbytes/sec., usually at the normal 10 Mbytes/sec. rate. The actual speed
is negotiated between the adapter and the device at the start of a transfer. If dis-
abled, this will be limited to 5 Mbytes/sec. This allows for single-ended bus
segments that exceed the three meter fast limit and, therefore, must be speed re-
stricted.
2.7 SCSI Bus Reset-on-Boot
For some high-availability configurations, SCSI bus resets on system boot are not
desired as there may be another adapter on the same bus. This defaults to no
SCSI bus resets sent on the bus during boot, but can be configured to issue them.
2.8 Device Wide Negotiation
Because some older devices fail to conform to the SCSI specification for wide
negotiation, they may not be recognized by the KZPSA unless wide negotiation
is disabled. The adapter default allows wide negotiation.
2.9 Device Synchronous Negotiation
Because some older devices fail to conform to the SCSI specification for syn-
chronous negotiation, they may not function correctly unless synchronous nego-
tiation is disabled. The adapter default allows synchronous negotiation.
2.10 Device Tagged Queuing
Because some older devices fail to conform to the SCSI specification for tagged
command queuing, they may not function correctly if tagged command queuing
is allowed. The adapter default allows tagged command queuing.
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