Acer SmartRAID V Bedienungsanleitung Seite 197

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Theory of Operation
Multi-Mode SCSI
To ensure backward compatibility with existing SCSI devices, all
SmartRAID V Ultra2 controllers support both LVD and single-ended
devices. This is referred to as multimode SCSI. Both types of devices can
be attached to the same SCSI bus with the following restrictions:
If all devices on the bus are Ultra2, the bus operates in LVD mode and
runs at the maximum Ultra2 speed (40 MHz).
If the devices are a mix of 40 MHz Ultra2 and 20 MHz Ultra single-
ended, the bus operates in single-ended mode and runs at 20MHz.
!
CAUTION
!
Do not use both LVD and High Voltage Differential devices on the
same SCSI bus.
Do not attach High Voltage Differential devices to an Ultra2 bus.
Wide SCSI
The SCSI-2 specification defines 8-bit, 16-bit and 32-bit bus widths. All
SmartRAID V controllers use a 16-bit bus and support both 8-bit and 16-bit
SCSI devices.
SCSI Transfer Rate
SmartRAID V controllers are capable of handling a combination of SCSI
devices with different transfer speeds, and both synchronous and
asynchronous protocols on the same SCSI bus. Using the SCSI message
protocol, SmartRAID V controllers automatically negotiate with each
device during the power-on sequence to determine the fastest transfer
speed and protocol for that device.
SmartRAID V controllers can also detect the presence of an external SCSI
cable and automatically lower the maximum SCSI bus transfer rate when
an external cable is present. (Both the external and internal cable transfer
rates are lowered.) Because some external SCSI cabling methods are not
capable of handling the maximum possible transfer rates without causing
data errors, this feature protects you from data integrity problems.
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