3.1 Control/Sense Commands

For the "Reservation Key" field, an 8-byte key code provided by the application client is set in order to enable the drive to identify the initiator that is the source of the PERSISTENT RESERVE OUT command. The drive can then verify that the "Reservation Key" field in the PERSISTENT RESERVE OUT command matches the registered reservation key for the initiator that issues the command. However, if the reservation key value is zero, which means no reservation key is registered, the specified value in this field is ignored. If the key specified for the PERSISTENT RESERVE OUT command does not match the registered reservation key for the initiator, the drive returns the RESERVATION CONFLICT status. This reservation key of the initiator is valid to all service actions and Scopes.

The "Service Action Reservation Key" field must be specified for the REGISTER, PREEMPT, and PREEMPT AND ABORT service actions. In the REGISTER service action, a new registered reservation key is specified in this field. In the PREEMPT and PREEMPT AND ABORT service actions, a reservation key of the initiator that holds the reservation requirements to be preempted is specified in this field. In the PREEMPT or PREEMPT AND ABORT service actions, if the value specified in this field does not match any registered reservation key, the drive returns the RESERVATION CONFLICT status. In other service actions, the value specified in this field is ignored.

If the Scope is the Element reservation, the "Scope-specific Address" field contains the Element address, zero filled in the most significant bytes to fit the field. If the service action is REGISTER, REGISTER AND IGNORE EXISTING KEY, or CLEAR, or if the Scope is a Logical Unit reservation, the "Scope-specific Address" field is set to zero.

The "Activate Persist Through Power Loss (APTPL)" bit shall be valid only for the REGISTER service action. In any other service action, the APTPL bit is ignored. Support for the APTPL bit is optional. If a value is specified for a drive that does not support the APTPL bit, the drive returns the CHECK CONDITION status and terminates this command. In this case, the sense key is set to ILLEGAL REQUEST [=5], and sense data is set to INVALID FIELD IN PARAMETER LIST [=26- 00].

If the last APTPL bit value received by the driver is zero, all persistent reservations are released and all reservation keys are cleared by turning off the power to the target (See Section 4.2.1.1). If the last APTPL bit value received by the driver is one, the logical unit keeps all persistent reservations and reservation keys for all initiators even after unit power is turned off once and turned on again. (MA*3*** series product saves the registration information in the SA space.) The APTPL value controls the operation of the logical unit while power is off, and it is always valid even if it is received from an initiator.

Table 3.4 summarizes which fields are defined by the application client and interpreted by the drive for each service action and scope value. The reservation keys and APTPL are explained in previous sections.

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

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.