3.1.15REQUEST SENSE (03)

Byte

Bit

7

6

5

 

4

 

3

 

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

X‘03’

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

LUN

 

 

0

0

 

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

2

 

0

0

0

0

0

 

0

0

0

 

 

 

 

 

 

 

 

 

 

 

3

 

0

0

0

0

0

 

0

0

0

 

 

 

 

 

 

 

 

 

4

 

 

 

 

Transfer Byte Length

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

0

0

0

0

0

 

0

Flag

Link

 

 

 

 

 

 

 

 

 

 

 

 

 

This command transfers sense data to the INIT. This command is executed immediately without queueing in a system which issues only commands with no tags or links.

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.

ξIf 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.

ξIf 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.

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C141-E124-01EN

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Image 115
Fujitsu MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES specifications Request Sense
Page 114 Page 116

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.

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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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