SCSI device request refers to a command or instruction sent by a computer's SCSI (Small Computer System Interface) host adapter to a SCSI device. SCSI is a popular interface used for connecting peripheral devices such as hard drives, printers, scanners, and tape drives to a computer.
When a SCSI device request is initiated, it typically involves the transfer of data to or from the SCSI device. This request encompasses a wide range of commands that instruct the SCSI device on various operations, such as reading or writing data, verifying data integrity, seeking specific data locations, or performing other device-specific functions.
A SCSI device request contains information including the command code, logical unit number (LUN), and often additional parameters related to the specific command being executed. The command code specifies the operation to be performed, such as a read or write operation, and the LUN identifies the specific device within a SCSI bus or chain.
The SCSI device request is sent by the SCSI host adapter to the targeted SCSI device, which processes the command and carries out the requested operation. The device may respond with status information or additional data, if applicable.
Overall, SCSI device requests play a crucial role in facilitating communication between the computer and peripheral devices through the SCSI interface, enabling efficient data transfer and control over multiple devices in a computer system.
