ADAPTEC AIC-7902 DUAL CHANNEL DRIVER
It also eliminates latencies in the disconnection, bus free, arbitration, and reselection phases. Ultra SCSI eliminates these latencies. However, there have always been certain latencies associated with the overhead tasks of managing the data path from one bus to another. With Ultra SCSI, for instance, a new transfer cannot begin until an active transfer is complete, requiring multiple steps. Ultra Streaming Data Path optimizes performance by enabling a new transfer to begin on the bus before the active transfer has finished. This allows commands to be streamed to both buses, allowing each to operate at peak efficiency to deliver full Ultra speeds.
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Adaptec’s RPP sends commands to a target, receives status packets from a target, and transfers data to and from a target – all at the theoretical maximum speed of MB across the SCSI bus.
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Command management has become a critical performance issue because each Ultra SCSI channel can accommodate up to different packetized commands in synchronous mode. This means that commands now can flow to the bus as rapidly as bus processing will allow – if there is a mechanism for organizing and retrieving the commands quickly enough. The also sports two external very high-density connector interfaces VHDCI and one internal high-density pin connector to provide users with a wide variety of connection options.
Adaptec’s Seamless Streaming Technology features Adaptec-designed, dedicated hardware engines that automatically handle the packet protocol. This allows commands to be streamed to both buses, allowing adaptecc to operate at peak efficiency to deliver full Ultra speeds. As SCSI generations have advanced in speed and capability, new design solutions have had to be devised to extract the highest possible real-world performance out of the industry standard specification.
New command-management methods are required to realize the full performance potential of the specification since it incorporates new capabilities that require a different chanmel of handling commands. However, there have always been certain latencies associated with the overhead tasks of managing the data path from one bus to another.
Adaptec’s new Seamless Streaming Technology pushes the performance of Ultra SCSI to its theoretical limit by implementing in hardware three key new design advances:. Seamless Streaming Technology Products. Plus, command and status phases are accomplished in relatively slow asynchronous mode, and are limited to a single transfer per connection. Adaptec’s Seamless Streaming Technology gives users a performance edge in Ultra SCSI by innovatively exploiting the full performance potential of the standard’s specification to deliver the theoretical maximum data throughput speed.
This improves performance by maximizing bus utilization and minimizing command overhead because multiple commands can be transferred in a single connection and at higher speeds. Adaptec’s innovative Seamless Streaming Technology boasts advances that allow enterprise servers and workstations to achieve the full performance potential of Ultra SCSI data throughput.
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Because the Ultra SCSI bus could only handle a single command per connection, there was plenty of time to retrieve individual commands. However, in order to realize the complete MB data transfer speed, packetization must be carried out as efficiently as possible.
Now it is possible to initiate a new context on the bus immediately after the previous context – if the data path allows. In order to achieve the maximum possible data throughput of Ultra SCSI, Adaptec has designed a hardware engine that goes beyond the limitations of current Ultra SCSI implementations to take full advantage of the performance duzl of the newest generation SCSI specification.
Ultra SCSI eliminates these latencies. At Ultra SCSI data transfer speeds, any software intervention to perform command management would reduce overall throughput. With Ultra SCSI, for instance, a new transfer cannot begin until an active transfer is complete, requiring multiple steps. In an Ultra SCSI bus, for each new command the SCSI connection must be completely closed, then re-established, the command retrieved, then sent, and the entire process repeated for each command.
It also dua latencies in channeel disconnection, bus free, arbitration, and reselection phases. Ultra Streaming Data Path optimizes performance by enabling a new transfer to begin on the bus before the active transfer has finished.
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Ultra SCSI packetizes commands, data, and status information, and transfers them at synchronous speeds. Aif-7902 AIC with Ultra Streaming Data Path virtually eliminates the overhead associated with establishing a solid SCSI connection, enabling the bus to take full advantage of packet protocols and deliver its maximum throughput speed.
Such streaming performance has not been possible before. This proprietary queuing arrangement enables the streaming delivery of all the commands for a specific target.
With RPP, Adaptec’s Seamless Streaming Technology delivers the fastest and smoothest transmission of multiple commands in a single connection.