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Fujitsu MAS3367, MAP3367, MAP3147 Control/Sense Commands, Persistent Reserve OUT service actions

Models: MAP3735 MAP3147 MAS3367 MAP3367 MAS3735

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3.1 Control/Sense Commands

The RESERVE, PREEMPT, and PREEMPT AND ABORT service actions of this command determine whether any conflict of Scope or Type specifications occurs between two reservation requirements: the new one provided by this command, and the other one already being held on the drive. If the reservation requirements conflict, the command is rejected and returned with the RESERVATION CONFLICT status. In this case, RESERVE, PREEMPT, and CLEAR processing is not executed. However, if the reservation requirement held by an initiator is preempted (specified by the service action reservation key) in the RESERVE, PREEMPT, or PREEMPT AND ABORT service action, the reservation requirement is excluded from the conflict determination.

The RELEASE and CLEAR service actions do not conflict with any reservation requirements. (However, if a reservation key is not registered, or if a reservation key does not match the reserved one, it returns the RESERVATION CONFLICT status.)

If an initiator that does not register a reservation key issues this command specified with a service action other than REGISTER or REGISTER AND IGNORE EXISTING KEY, the command is rejected and returned with the RESERVATION CONFLICT status.

The PERSISTENT RESERVE OUT command includes fields for specifying the type of PERSISTENT RESERVATION service action, the applied Scope of a persistent reservation, and the restrictions defined by a persistent reservation. For definitions of "Type" and "Scope" fields, see Sections 3.1.18.3.1 and 3.1.18.3.2. If the specified Scope value cannot be executed on the device, the drive returns the "CHECK CONDITION" status. The sense key is set to ILLEGAL REQUEST [=5], and sense data is set to INVALID FIELD IN CDB [=24-00].

In fields on the PERSISTENT RESERVE OUT parameter list, information about the reservation key and elements that are required for executing the PERSISTENT RESERVATION service action is specified.

The parameter list is 24 bytes in length so the "Parameter List Length" field must contain "24 (18h)." If the parameter list length is not "24 (18h)," the drive returns the CHECK CONDITION status. Moreover, the sense key is set to ILLEGAL REQUEST [=5], and the sense data is set to PARAMETER LIST LENGTH ERROR [=1A-00].

A logical unit uses nonvolatile memory to maintain persistent reservations and the registered keys (even after unit power is turned off). (The AL-7 series product uses the SA space.) If the nonvolatile memory is in the access-disabled state when the Active Persist Through Power Loss facility is enabled (to maintain reservation requirements after unit power is turned off) by issuing the PERSISTENT RESERVE OUT command, the drive returns the CHECK CONDITION status. The sense key is set to NOT READY [=2], and sense data is set as defined in the TEST UNIT READY command.

3.1.19.1 PERSISTENT RESERVE OUT service actions

To execute a service action of the PERSISTENT RESERVE OUT, the drive updates the "Generation" value as described in the Section 3.1.18.

Table 3.3 describes the service actions of the PERSISTENT RESERVE OUT command.

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Fujitsu MAS3367, MAP3367, MAP3147, MAS3735, MAP3735 Control/Sense Commands, Persistent Reserve OUT service actions
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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.