Patent application number | Description | Published |
20120079185 | TAPE STORAGE SYSTEM INCLUDING MULTIPLE TAPE STORAGE APPARATUSES - A tape storage system according to one embodiment includes two or more tape storage apparatuses each having a buffer divided in fixed-length segments, and being connectable to a host, where a first of the tape storage apparatuses is configured to receive multiple data clusters and a synchronization request from a host, and, when one of the segments of the buffer is accumulated and filled with the data, to write the accumulated data onto a tape. A second of the tape storage apparatuses is connected to the first tape storage apparatus, the second tape storage apparatus being configured to receive the multiple data clusters sent from the host via the first tape storage apparatus, and being configured to write a predetermined number of data clusters accumulated in the segments thereof onto a second tape at a timing corresponding to the synchronization request. | 03-29-2012 |
20140108720 | HIGH RESOLUTION TAPE DIRECTORY (HRTD) STORED AT END OF DATA IN AN INDEX PARTITION - In one embodiment, a tape drive system includes a file system adapted for enabling sequential access to data on a tape medium, a file access controller adapted for managing the data, the file access controller including logic adapted for writing a file on the tape medium, logic adapted for writing a pointer of the written file in an index of the tape medium, wherein the pointer is managed by the file access controller, logic adapted for creating a high resolution tape directory (HRTD) including detailed location information of data on the tape medium, and logic adapted for storing the HRTD as part of end of data (EOD) of the index when a tape cartridge housing the tape medium is unloaded. Other systems, methods, and computer program products are described according to more embodiments. | 04-17-2014 |
20150100705 | DYNAMIC SYMBOLIC LINKS FOR REFERENCING IN A FILE SYSTEM - Embodiments of the invention relate to providing dynamic absolute-path symbolic links. According to one embodiment, indication of a symbolic link is received, which references a target, the indication including an absolute path of the target that includes a target mount point and a name of the target. A current mount point of the target is identified, and a verification is made that the target mount point is identical to the current mount point. When the target mount point is identical to the current mount point, a string length of the current mount point is determined, and an in-memory record of the symbolic link is created. The in-memory record includes the string length of the current mount point associated with the symbolic link. | 04-09-2015 |
20150120740 | FILE SYSTEM IMPLEMENTING WRITE ONCE READ MANY (WORM) - The embodiments deal with files that are already present in a storage when mounting the storage in a file system and files created after the mounting as different groups. (Metadata of) the files is classified. The files are each divided into metadata (index) and a file main body and are recorded on different storage areas, that is, an index partition (IP) and a data partition (DP), associated with each other. This file system is effective in a storage format in which a new file is merely written and an already written file is not updated or deleted (for example, a tape medium used in the LTFS). The embodiments implement a WORM file system by rejecting a request to update or delete a file that is present at mounting as a WORM file and permitting update or deletion of a file that is created after mounting until the storage is unmounted. | 04-30-2015 |
20150120741 | FILE SYSTEM IMPLEMENTING WRITE ONCE READ MANY (WORM) - The embodiments deal with files that are already present in a storage when mounting the storage in a file system and files created after the mounting as different groups. (Metadata of) the files is classified. The files are each divided into metadata (index) and a file main body and are recorded on different storage areas, that is, an index partition (IP) and a data partition (DP), associated with each other. This file system is effective in a storage format in which a new file is merely written and an already written file is not updated or deleted (for example, a tape medium used in the LTFS). The embodiments implement a WORM file system by rejecting a request to update or delete a file that is present at mounting as a WORM file and permitting update or deletion of a file that is created after mounting until the storage is unmounted. | 04-30-2015 |
Patent application number | Description | Published |
20140022665 | CONTROLLING A TAPE SPEED TO MANAGE A TAPE DRIVE BUFFER - Provided are a storage device, method, and program for controlling a tape speed to manage a tape drive buffer. A tape speed is increased from a current tape speed to a target tape speed on a predetermined speed-change timing to control the reading or writing of data between the buffer and the tape medium. | 01-23-2014 |
20140313609 | DATA WRITING METHOD AND PROGRAM FOR TAPE DRIVE - One embodiment includes a method for writing data to a tape in a tape drive while data successively accumulated in the buffer of a file system is transferred to the tape drive. The method includes detecting a wrap turn when data is being written to the tape; allocating buffer space including a storage capacity exceeding the amount of data to be stored in the buffer during the wrap turn; successively accumulating write data in the buffer space instead of the buffer during the wrap turn; resuming the accumulation of write data in the buffer after the wrap turn has been completed; and releasing the buffer space after the write data accumulated in the buffer space has been transferred to the tape drive. | 10-23-2014 |
20150036237 | CONTROLLING A TAPE SPEED TO MANAGE A TAPE DRIVE BUFFER - Provided are a storage device, method, and program for controlling a tape speed to manage a tape drive buffer. A tape speed is increased from a current tape speed to a target tape speed on a predetermined speed-change timing to control the reading or writing of data between the buffer and the tape medium. | 02-05-2015 |
20150037010 | TRANSFERRING MULTIPLE RECORDS INCLUDING VIDEO DATA - In one embodiment, a method includes receiving from the host a video special mode for reading video data, and sequentially reading the records included in data sets from the tape medium into segments of a buffer. When there is a C2 error during reading of the data sets, a predetermined error recovery process is skipped in accordance with the video special mode. When management information (DSIT) for the data set having the C2 error is available for reading, sending of the record(s) included in the data set having the C2 error to the host is skipped. For the data set having the C2 error, the number of records to be skipped included in the data set having the C2 error based on and from the DSIT is obtained and indicated to the host. | 02-05-2015 |
20150055241 | Method for Writing File on Tape Medium that can be Read at High Speed - Mechanisms for writing a file on a tape medium in a manner that enables high-speed reading are provided. A predetermined format is applied to the medium that divides the medium into a first region of a predetermined length in a longitudinal direction from a region of the medium, and a second region that extends from an end of the first region to a terminal region of the medium in a longitudinal direction and that has a predetermined width with respect to a width of the medium in a transverse direction. Writing a top data portion of a predetermined data amount of the data of the file in the first region and writing data of the file in the second region are performed. | 02-26-2015 |
20150077878 | DATA WRITING METHOD AND PROGRAM FOR TAPE DRIVE - One embodiment includes a method. The method includes sending data from a buffer to a tape drive, and allocating buffer space when a wrap turn is anticipated. The write data is accumulated in the buffer space during the wrap turn. The buffer space is released after the write data accumulated in the buffer space has been transferred to the tape drive. | 03-19-2015 |
20150146317 | RECLAMATION OF DATA ON TAPE CARTRIDGE - A method is provided for automatically reclaiming areas with unneeded data in a tape cartridge (medium) storing files updated by appended writing. In this reclamation method, the appended writing entails the sequential compression of data needed by the updated file (needed data) and data not needed by the file (unneeded data) and storage of the compressed data on the medium, and the medium is divided into at least three data partitions for the storage of data. | 05-28-2015 |