Command Processing

(1)When power on, RESET or TARGET RESET occurs

If the IDD’s power is switched on, the IDD enters the RESET condition or is reset by a TARGET RESET message, this UNIT ATTENTION condition is generated for all the INITs, regardless of whether the disk drive is in the ready state or not.

(2)Mode parameters changed (changed by another INIT)

If the parameters specified in the MODE SELECT or MODE SELECT EXTENDED command are changed by any INIT, a UNIT ATTENTION condition is generated for all the INITs other than the INIT which changed the parameters.

(3)Commands cleared by another INIT

Commands which are being executed or which are queued are cleared if one of the following events occurs, and this UNIT ATTENTION condition is generated.

•The CLEAR TASK SET message is issued by any INIT.

•Tagged queuing is prohibited by a MODE SELECT or MODE SELECT EXTENDED command (Page A send) from any INIT. (DQue = “1”)

•The sense hold state of an INIT is released when “1” is specified in the QErr bit of MODE SELECT parameter page A.

However, the IDD does not enter the UNIT ATTENTION condition hold state for an INIT that issues a CLEAR TASK SET message, an INIT that issues a MODE SELECT or MODE SELECT EXTENDED command, or an INIT that releases the sense hold state.

(4)Changed operating definition

When the operation mode is changed by the CHANGE DEFINITION command, the UNIT ATTENTION condition is generated for all INITs.

1.5.2Response and release condition at UNIT ATTENTION condition hold state

A UNIT ATTENTION condition generated by the IDD by the occurrence of the previously mentioned events is held individually for each INIT and it is held until it is released by the INIT it is held for issuing the commands specified below.

When the IDD is holding a UNIT ATTENTION condition, if the IDD receives a command from the INIT that the UNIT ATTENTION condition is held for, it performs one of the following operations depending on the type of command issued.

(1)Commands other than the INQUIRY and REQUEST SENSE commands

The IDD reports a CHECK CONDITION status to the issue command. The UNIT ATTENTION condition for that INIT is then cleared by the CHECK CONDITION status report. The sense key of the sense data generated at this time is UNIT ATTENTION [=6] and the sense codes shown below indicate the event that generated the UNIT ATTENTION condition.

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Fujitsu MAP3735, MAP3367, MAP3147, MAS3735, MAS3367 specifications Command Processing
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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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