Because data integrity and reliability are equally critical to overall system performance, Ultra160 SCSI offers both Cyclic Redundancy Checking (CRC) and Domain Validation.
Error checking is imperative for high-speed operations; Ultra160 SCSI's CRC technology ensures that all data sent reaches its intended destination in correct form. Each data block sent contains extra bytes that let the receiving device, regardless of its class; harddisk, CD-RW or otherwise, to validate its contents. This is especially important in an electrically noisy environment, where electromagnetic fields may alter the data block's contents. The CRC technology ensures that the data block is checked and verified prior to being processed; errors generate a request to resend.
Domain Validation intelligently verifies system configuration. During the boot cycle, or any time a new SCSI device is connected, the host adapter tests for the device's maximum speed. This process is very similar to the way modems communicate to determine the highest possible baud rate; no user data is sent until a suitable speed is negotiated and a proper connection is made.
Domain Validation offers more to SCSI technology than just setting reliable speed limits. It also allows the user to monitor performance and pick up on any bottlenecks and predict possible problems in order to improve performance and better maintain the SCSI bus.
Naturally, Ultra160 takes full advantage of all commands built into the current SCSI standard. For example; SCAM, SCSI Configured AutoMatically, lets devices negotiate with the host adapter and set up features such as termination, synchronous or asynchronous communication, SCSI ID and busspeed. Tagged Command Queuing optimizes transfer speed by re-ordering blocks of data, giving smaller blocks priority. Disconnect/Reconnect allows a device to disconnect from the bus while performing a complex task and reconnect when done, allowing other devices freer access and speeding up overall data transfer.
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