3.1 Control/Sense Commands

The length of the sense data in the IDD is 48 bytes. The "Transfer byte length" field in the CDB indicates the number of bytes of sense data which can be received by the INIT. The IDD transfers sense data to the INIT by either of the following two methods, depending on the specification in the CHANGE DEFINITION command (SCSI level). Furthermore, see Section 3.1.4 (SCSI Level) concerning the CHANGE DEFINITION command.

•If the SCSI-3/SCSI-2 mode is specified in the CHANGE DEFINITION command, the IDD transfers the number of bytes of sense data specified in the "Transfer byte length" field or the number of bytes in the sense data held by the IDD (48 bytes), whichever is smaller, to the INIT. When zero is specified in the "Transfer byte length" field, this command is terminated with nothing transferred, but in this cases also, the sense data held by the IDD are cleared.

•If SCSI-1/CCS Mode is specified in the CHANGE DEFINITION command, when zero is specified in the "Transfer byte length" field, the IDD transfers to the INIT only 4 bytes of sense data, from the top. When a value other than zero is specified in the "Transfer byte length" field, the IDD transfers to the INIT the number of bytes of sense data specified in the "Transfer byte length" field or the length of sense data held by the IDD (48 bytes), whichever is smaller.

As described in Section 1.6 "Sense Data Hold State," if the IDD terminates a command which it is currently executing abnormally, it generates sense data for the INIT that issued that command and maintains those sense data in the hold state.

Sense data are held in a valid state until they are read by a REQUEST SENSE command from the INIT for which they are held. However, sense data which are being held are cleared by an ABORT TASK SET message from the INIT for which they are held, a TARGET RESET message or CLEAR TASK SET message from any INIT, or a RESET condition.

If a command is terminated with a CHECK CONDITION status, when the SCSI bus enters the BUS FREE phase unintentionally during execution of a command, or when the INIT detects that there is no reconnection request from the IDD, the INIT should issue this command and fetch the sense data.

Note:

See Section 1.6, "Sense Data Hold State" concerning details of the sense data hold state and see Section 5.1, "Sense Data" concerning the format of sense data transferred by this command from the IDD to the INIT, and its contents.

If this command is issued while the IDD is holding the UNIT ATTENTION condition, if the IDD is not in the sense data hold state at that point, sense data indicating the UNIT ATTENTION condition are sent to the INIT by this command and the UNIT ATTENTION condition is cleared. For details, see Section 1.5, "UNIT ATTENTION Condition."

If this command is issued when valid sense data are not being held, the IDD sends the sense key "NO SENSE[=0]" with sense data showing the message "No additional sense information [=00-00]" to the INIT.

This command is terminated abnormally with a CHECK CONDITION status reported only when the conditions shown below are detected. In this case, new sense data are generated and the sense data which had been held up to that point are lost.

•An error in a specification other than the LUN field of the CDB

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Fujitsu MAP3367, MAP3147, MAS3735, MAP3735, MAS3367 specifications Control/Sense Commands
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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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