公开(公告)号：JP2000132507A

公开(公告)日：2000-05-12

申请号：JP30526998

申请日：1998-10-27

Applicant: IBM

Inventor： INOUE KAZUNORI ,  FUKUHISA RYOJI ,  NAKAMURA YASUHIRO ,  ISHIBASHI KAZUYUKI ,  SAITO HIROSHI

IPC: G06F13/12 ,  G06F13/42

Abstract: PROBLEM TO BE SOLVED: To provide a command processing method which is used for an SCSI (small computer system interface) protocol and can improve the system throughput and also to provide a device that can be used for the command processing method. SOLUTION: This command processing method is applied to the queuing with a tag having >=2 queue depth of an SCSI protocol. When the continuous write commands are processed, the end of each write command is detected and a response is returned to a host to notify the end of the writing. If the new commands which can be continuously processed are received against a command that is currently processed, the received new commands are added to the command under processing to dynamically extend the internal processing information. Thus, the received commands are executed continuously to the command under processing. In such a constitution, the system throughput can be improved.

公开(公告)号：JP2001022529A

公开(公告)日：2001-01-26

申请号：JP18470299

申请日：1999-06-30

Applicant: IBM

Inventor： SAITO HIROSHI ,  FUKUHISA RYOJI ,  INOUE KAZUNORI

IPC: G06F3/06 ,  G06F12/00

Abstract: PROBLEM TO BE SOLVED: To obtain a disk drive device which prevents rotational delay that can occur in a multi-drive environment and can improve performance and its controlling method. SOLUTION: This device is provided with a microprogram consisting of a queue handler 7 which stores a plurality of commands issued by a host in a queue area, performs a reorder to decide a command to be carried out and a requests the decided command to be executed, an interface handier 8 which executes the processing of an interface side including data transfer between the host and a drive device 2 according to the command requested to be executed and a drive handler 9 which executes the processing of a drive side according to the command requested to be executed and requests the device 2 to perform reading/writing about the execution of the command, separates the processing of the interface side from the processing of the drive side about the command processing and prevents the processing of the interface side from affecting the start of the processing of the drive side.

公开(公告)号：JPH11110139A

公开(公告)日：1999-04-23

申请号：JP26236897

申请日：1997-09-26

Applicant: IBM

Inventor： FUKUHISA RYOJI ,  SAITO HIROSHI ,  HIRASHITA SHOICHI ,  HASHIMOTO MINORU

IPC: G06F3/06 ,  G11B20/10

Abstract: PROBLEM TO BE SOLVED: To make improvable the performance of inverse reading by starting reading data at an address preceding to a current address at the time point, when the reading of data from a storage medium is finished, when the inverse reading is detected. SOLUTION: A magnetic disk device 10 is provided with a magnetic disk 11, magnetic head 12, actuator mechanism 13, hard disk controller 17 and RAM 18 or the like. The hard disk controller 17 controls operation such as the read/ write of data to the magnetic disk 11. The RAM 18 temporarily stores the supplied data and caches recording/reproducing data. This data reading method is a data reading method for reading data from the storage medium and has an inverse direction detecting step for detecting the inverse reading and a step for starting reading data at the address preceding to the current address at the time point when data are completely read out of the storage medium.

公开(公告)号：JPH05233513A

公开(公告)日：1993-09-10

申请号：JP33799591

申请日：1991-11-28

Applicant: IBM

Inventor： MURAKAMI MASAYUKI ,  SAITO HIROSHI ,  IWASA HIROYUKI

IPC: G06F13/12 ,  G06F13/24

Abstract: PURPOSE: To provide an interface circuit executing data transfer without error by means of the same hardware whatever mode a host is in. CONSTITUTION: In a computer system including a pre-reading mode starting block data transfer after reading the situation of the pertinent device in response to interruption from a peripheral device (HD) or a host reading the situation after finishing block data transfer, the interface is provided with a mode detection means 60 automatically detecting which mode the host is operated in order to execute data transfer without an error between the peripheral device and the host whatever mode the host is in, a delay means 62 delaying a data request DRQ showing block data transfer preparation is finished when a post-reading mode is detected by a prescribed time, and an interruption means 64 sending an interruption request IRQ to the host in response to the output of this delay means.

公开(公告)号：JP2001100935A

公开(公告)日：2001-04-13

申请号：JP27403699

申请日：1999-09-28

Applicant: IBM

Inventor： SAITO HIROSHI ,  TAKAHASHI YOSHIYO ,  HIRASHITA SHOICHI

IPC: G06F3/06 ,  G06F11/00 ,  G06F11/14 ,  G11B19/02

Abstract: PROBLEM TO BE SOLVED: To make the command processing efficient by shortening the disk rotation wait time at command execution time. SOLUTION: In command processing wherein multiple execution wait commands sent from a host device are put in a command queue (ENQUE) and a command to be executed next is selected out of the commands (PRO SORT) and executed (KICK NEXT, KICK SEEK), the command which is being executed put back in the command queue if an error occurs to drive-side processing (processing relating to disk access) (error) during the execution of the command, and a command to be executed next is selected out of the execution waiting commands including the put-back command (ERR processing, PRO RESORT) and executed (KICK NEXT, KICK SEEK).