Fujitsu Corporation

Fsas Technologies Inc.

Tomohiro Uno

Tomonori Furuta

Hiroyuki Yamashita

Takashi Kuwayama

Yasuhito Kikuchi

Yoshimasa Mishuku

Takuya Nagao

Shota Yamashita

An information processing device includes a processor. The processor configured to extract part of data from estimation target data as a plurality of pieces of sample data and manage a number of duplications of the extracted plurality of pieces of sample data, classify the plurality of pieces of sample data into a first group and a second group based on the number of duplications, the first group having a number of duplications equal to or less that a predetermined number, the second group having a number of duplications more than a predetermined number, specify a first deduplication rate for sample data classified into the first group, specify a second deduplication rate for sample data classified into the second group, and specify a deduplication rate of the estimation target data based on the first deduplication rate and the second deduplication rate.

Information processing device and non-transitory computer-readable storage medium

A process for reducing amount of transmission of data to/from an external storage is performed in a computer. The process includes: storing a plurality of data sets by deduplicating a plurality in the external storage, wherein two or more data sets selected in order generated are collected in an object; determining necessity/unnecessity of defragmentation in units of object group in which two or more objects are collected in order generated; when determining to execute defragmentation, executing first defragmentation processing of acquiring all of the objects included in the object group as first objects from the external storage, combining valid data set having a number of references of 1 or more included in the first objects based on the order generated and the number of references to regenerate one or more second object, and storing the second object in place of the first objects in the external storage.

Information processing apparatus and recording medium storing information processing program

A data processing apparatus includes a memory configured to store a bit array including a first Bloom filter associating with a first subset containing a data element matching a first classification condition and a second Bloom filter associating with a second subset containing a data element matching a second classification condition, and a processor configured to, when a first data element to be a search target is inputted, determine whether the same data element as the first data element is present in the first subset by using the first Bloom filter, determine whether the same data element as the first data element is present in the second data subset by using the second Bloom filter, and when all the data elements contained in the first subset are deleted, delete the first Bloom filter from the bit array.

Data processing apparatus, non-transitory computer-readable storage medium, and data processing method

A storing unit stores a data set including a plurality of data elements and a first Bloom filter used to determine whether a query-target data element is present in the data set. A calculating unit deletes, when some data elements are deleted, a first bit array from the first Bloom filter. The first bit array has the number of bits corresponding to the number of deleted data elements. When a query-target first data element is entered, the calculating unit adds a second bit array temporarily to a second Bloom filter obtained by deleting the first bit array. The second bit array has the same number of bits as the first bit array, with all bits set to a specific value. Using the second Bloom filter, the calculating unit determines whether the first data element is present in the data set, from which some data elements have been deleted.

Data presence/absence determination apparatus and computer-readable storage medium storing program for determination of data presence/absence

A virtualization controller identifies a node that manages a segment to be accessed, and instructs the node to access the segment. A mirror controller of the node instructed to access the segment writes data in the segment managed by the node and in a segment having a mirror relation with the segment managed by the node.

Growing community of inventors

Nagoya, Japan

Tomohiro Uno