Title:
磁気テープへの書込み制御方法及びその方法を実行する磁気テープ装置
Document Type and Number:
Japanese Patent JP4912472
Kind Code:
B2
Abstract:
[Object] To provide a method for controlling writing for reducing the effects of a backhitch that occurs when a synchronous command is issued in a writing operation in a magnetic tape unit. [Solving Means] A method for controlling writing for a tape recorder that is connected to a host and sequentially records, as a transaction, a plurality of records that are transferred from the host and stored in a buffer is provided. The control method includes a step of receiving a synchronous command for a first transaction from the host, a step of, in response to the synchronous command, sequentially writing the plurality of records stored in the buffer to a tape as the first transaction, a step of receiving the size of a second transaction following the first transaction from the host, a step of calculating time for a backhitch associated with an operation of the synchronous command for the first transaction on the basis of the size, and a step of performing the backhitch on the basis of the time for the backhitch. In the control method, the step of receiving the size receives the size of the second transaction at least before rewinding in the backhitch is started. Moreover, in the control method, the step of calculating the time for the backhitch minimizes the time for the backhitch on the basis of the size. The present invention also includes a tape recorder that implements the control method and a tape recording system that includes the host and the tape recorder connected to the host. In the present invention, since the distance over which a tape is rewound at the time of backhitching and the writing velocity can be selected in a manner that depends on the size of the next transaction, an advantageous effect in which the overall performance of writing can be improved is achieved.
Inventors:
Takashi Katagiri
Application Number:
JP2009540051A
Publication Date:
April 11, 2012
Filing Date:
November 04, 2008
Export Citation:
Assignee:
INTERNATIONAL BUSINESS MASCHINES CORPORATION
International Classes:
G11B15/087; G06F3/06; G11B15/02; G11B15/46
Domestic Patent References:
| JP2006139903A | 2006-06-01 | |||
| JP2004341925A | 2004-12-02 |
Attorney, Agent or Firm:
Takeshi Ueno
Tasaichi Tanae
Yoshihiro City
Tasaichi Tanae
Yoshihiro City