other than cases where the command is in a queue, disconnect processing may not be executed depending on the processing content specification of the command.

(2)Basic disconnect processing procedure

Disconnect processing is executed basically by the following processing procedure.

1)If the IDD judges that it is possible for it to disconnect from the SCSI bus during execution of a command, it sends a DISCONNECT message to the INIT and enters the BUS FREE phase. At this time, if necessary, the IDD sends a message to activate a pointer in the INIT which precedes sending of the DISCONNECT message. Furthermore, for details concerning pointers, refer to the SCSI pointer description in “SCSI Physical Interface Specifications” and “Chapter 2 SCSI Messages.”

2)After the IDD enters the BUS FREE phase, it is possible for the INIT to issue other commands. Also, it is possible for an IDD which has performed disconnect processing to receive input/output operation requests from each INIT (this is explained in the description of the command queuing function in Section 1.4).

3)The IDD executes the command which performs disconnect processing internally.

4)After that, the IDD executes reconnection processing at the point, when it is necessary for operation on the SCSI bus, to reconnect with the INIT (See item (6) concerning reconnection processing).

(3)Disconnect processing procedure after COMMAND phase execution

If commands are queued (see Section 1.4), disconnect processing is performed immediately after the COMMAND phase execution is completed. In this case, the IDD switches from the COMMAND phase to the MESSAGE IN phase and sends the DISCONNECT message to the INIT.

(4)Disconnect processing procedure after data transfer execution

For commands which accompany a data transfer, disconnect processing may be performed during DATA IN or DATA OUT phase execution or after transfer of the last data is completed. In this case, caution is necessary when executing the following types of pointer controls.

a.If disconnecting during a data transfer

In cases where data transfer has begun (in DATA IN or DATA OUT phase) and it will take time until transfer of subsequent data can be transferred (example: When the data buffer has been emptied by a READ command, or the data buffer has ceased to be empty due to a WRITE command), disconnect processing is performed during data transfer. In this case, the IDD sends the SAVE DATA POINTER message before sending the DISCONNECT message. When the INIT receives the SAVE DATA POINTER message, it must save the current value of the current data pointer and make it possible to transfer data from the subsequent data at reconnection time.

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Fujitsu MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES specifications
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MAN3735, MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES, MAN3367, MAN3184 specifications

Fujitsu's MAN3184, MAN3367, and MAN3735 series disk drives represent a significant advancement in storage technology, catering to the needs of businesses seeking reliability, performance, and high capacity. These drives are designed for enterprise environments, providing exceptional data integrity and speed essential for effective data management.

The MAN3184 series is renowned for its high rotational speed of 10,000 RPM, which significantly enhances data access times. With a capacity of up to 18.4 GB, these drives are suitable for applications requiring quick read and write operations. The series employs an improved read/write head technology, which reduces latency and increases overall performance. This technology is complemented by advanced error correction mechanisms, ensuring the reliability necessary for critical data applications.

Transitioning to the MAN3367 series, these drives offer increased storage capacity and improved performance metrics. With capacities reaching up to 36.7 GB, they cater to growing data demands in modern enterprises. They also feature a 10,000 RPM spindle speed, ensuring that the drives can handle intensive workloads with ease. The MAN3367 drives include SCSI interface support, making them versatile and easy to integrate into various systems. The inclusion of intelligent caching algorithms allows for faster data retrieval, while built-in thermal management features ensure optimal performance, even under heavy usage.

The MAN3735 series takes performance up another notch, boasting higher capacities of up to 73.5 GB. These drives are particularly suited for environments that require high reliability and availability. The series utilizes a state-of-the-art SCSI Ultra160 interface, which maximizes data transfer rates, ultimately enhancing overall system efficiency. Additionally, the MAN3735 series employs advanced data protection technologies, including power loss protection and predictive failure analysis, which proactively minimizes potential downtime.

All these series of Fujitsu disk drives are built with a focus on durability and sustained performance. They are designed to operate seamlessly in high-demand environments, ensuring that organizations can rely on them for critical applications. Their compact design and energy-efficient operation make them an ideal choice for modern data centers looking to optimize space and reduce power consumption.

In summary, Fujitsu's MAN3184, MAN3367, and MAN3735 series disk drives deliver a blend of high capacity, performance, and reliability. These drives incorporate advanced technologies that address the evolving needs of enterprise storage solutions, making them a valuable asset for any organization aiming to enhance their data management capabilities.
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