Quantum LTO 4, Руководство пользователя

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SCSI Interface Overview Page 4
Data transfers at 300 megabytes per second
SAS differential signaling provides high noise immunity
One SAS port using single bidirectional phy
Full duplex operation
SAS target phy
Transport layer error handling
2.2.2 SAS protocol
Serial Attached SCSI communicates using frames. Five frame types are used:
•
Command frame
•
Task frame
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XFER_RDY frame
•
Data frame
•
Response frame
2.2.3 SAS transmission error detection/recovery
Transmission errors detected by CRC-32
2.3 SCSI Parallel Interface (SPI)
2.3.1 SPI General features
The SCSI interface LTO drive supports the following:
Integrated Single-Ended & Low Voltage Differential SCSI transceivers
ST data transfers with parity protection running a max rate of 80Mbytes/sec
DT data transfers with CRC protection running a max rate of 160Mbytes/sec
16 bit SCSI arbitration.
Disconnect/reconnect
Hard reset
2.3.2 Disconnect/Reconnect Function
When the drive is performing a task not requiring communication with the Initiator or
when the tape drive determines that a relatively long time will pass with no bus
activity, it disconnects from the SCSI bus. Examples are:
When rewinding the tape.
When writing to the tape and the buffer is full.
When reading from the tape and the buffer is empty.