1.3 Outline of Command Processing

6)When execution of the command is completed, the TARG reports the execution results by the status byte in the STATUS phase to the INIT.

7)The TARG reports the TASK COMPLETE message to the INIT in the MESSAGE IN phase and enters the BUS FREE phase.

1.3.2Command link

The command link function is a function which causes the TARG to execute continuous processing of multiple commands. Following shows examples of command link processing.

1)The INIT sets the initial values for the command in the command pointer, data pointer and status pointer.

2)Obtaining the SCSI bus usage, selection of the TARG and specification of the LUN by the IDENTIFY message are the same as in the case of single command.

3)The TARG receives commands from the INIT in the COMMAND phase, but “1” is specified in the Link bit of the control byte of the CDB.

4)The TARG analyzes the command and executes the requested processing.

5)If processing of the command is completed normally, the TARG reports the INTERMEDIATE status in the STATUS phase to the INIT. At this time, the command link function becomes effective.

6)The TARG informs the INIT of the LINKED TASK COMPLETE or the LINKED TASK COMPLETE WITH FLAG message, depending on the value of the Flag bit in the control byte of the CDB. When the INIT has received the LINKED TASK COMPLETE (WITH FLAG) message, the command, data and status pointers are updated to the initial values for the next linked command.

7)The TARG enters the COMMAND phase immediately after the MESSAGE IN phase and receives the command to be executed next. After that, it performs either single command (Link bit = “0”) processing or command link (Link bit = “1”) processing.

The command link continues until a command with “0” specified in the Link bit of its CDB is issued or until a command terminates abnormally.

The command link function is made effective only in the case that commands with link specifications are completed normally. If a command with a link specification is completed in an error state or in an exception state, the command link function is invalidated. Table 1.1 shows the response of the IDD when commands with a Link specification are terminated.

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Fujitsu MAS3735, MAP3367, MAP3147, MAP3735, MAS3367 specifications Outline of Command Processing, Command link
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MAP3735, MAP3147, MAS3367, MAP3367, MAS3735 specifications

Fujitsu, a renowned leader in technology and innovation, has developed a variety of reliable hard disk drives (HDDs) that cater to a wide range of data storage needs. Among these, the MAS3735, MAP3367, MAS3367, MAP3147, and MAP3735 series stand out for their advanced features and exceptional performance.

The MAS3735 is a high-capacity enterprise-class drive that boasts a storage capacity of up to 300 GB. Its 10,000 RPM spindle speed ensures rapid data retrieval and efficient performance, making it ideal for data-intensive applications. It utilizes a Serial Attach SCSI (SAS) interface, which allows for improved data transfer rates and increased reliability compared to traditional SATA drives. The drive is designed with advanced technologies such as error recovery and data integrity features, ensuring the safety and security of critical data.

Similarly, the MAP3367 and MAS3367 models are geared towards both enterprise and mid-range server environments, providing a storage capacity of up to 300 GB as well. These drives also operate at a spindle speed of 15,000 RPM, offering swift access times that enhance overall system performance. The MAP3367 employs the Ultra 320 SCSI interface, allowing for significant bandwidth and ensuring data is transmitted efficiently.

On the other hand, both MAP3147 and MAP3735 models provide versatile solutions for various applications, supporting capacities from 36 GB to 147 GB. The MAP3147, with its 10,000 RPM speed, is optimized for workloads requiring quick access and high throughput, making it suitable for transactional systems and enterprise applications. The MAP3735, while offering comparable capacity, emphasizes exceptional reliability and durability, which is crucial for environments that involve heavy data loads.

All these Fujitsu HDDs are characterized by their robust construction, reliability, and efficiency. They are built to withstand heavy workloads and are equipped with features like advanced thermal management and acoustic noise reduction, ensuring they operate effectively in data center environments.

In conclusion, Fujitsu's MAS3735, MAP3367, MAS3367, MAP3147, and MAP3735 series HDDs are designed for high performance and reliability, catering to both enterprise and mid-range environments. Their advanced features make them a strong choice for businesses looking to enhance their storage solutions while maintaining data integrity and system performance.
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