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虽然大多数台式计算机的外部设备尚未达到SCSI的最高数据带宽20M字节/秒,但高档服务器应用正在提出更高的性能要求.在服务器环境中,磁盘机阵列存储子系统已随处可见,而且更大的数据带宽一旦出现即被采用.为了满足越来越高的的数据传输速度要求,位于加州Milpitas的Adaptec公司推出了两种主适配器AHA-3985和AHA-3940,其中均含有PCI局部总线接口(图1).3985主要用于RAID子系统,但也可配用CD-ROM驱动器、磁盘机和大多数其他SCSI外
While most desktop computers have not reached the maximum data bandwidth of 20 megabytes per second for SCSI, high-end server applications are pushing for higher performance requirements. In a server environment, the disk array storage subsystem is ubiquitous and more In response to increasing data rates, Adaptec, based in Milpitas, California, introduced two main adapters, the AHA-3985 and the AHA-3940, which include a PCI local bus interface (Figure 1) .3985 is primarily used for RAID subsystems, but can also be used with CD-ROM drives, disk drives, and most other SCSI devices