International Business Machines Corporation

Eiji Tosaka

Katsuyoshi Katori

Takeshi Nohta

Norie Iwasaki

Hiroyuki Miyoshi

Yutaka Oishi

Shinsuke Mitsuma

Koichi Masuda

Kohei Taguchi

Kousei Kawamura

Ryohta Kawase

Sosuke Matsui

Atsushi Abe

Takashi Katagiri

Naoki Imai

Katsumi Yoshimura

Yuki Asakura

A data storage change is received for a piece of data, wherein the data storage change is from a first location to a second location. Two or more possible paths to perform the data storage change are determined. A plurality of weights for each path of the two or more paths is determined. A weighted transfer time for each path of the two or more paths is determined.

Cloud data migration

A method, computer system, and a computer program product for objective-based compression level change is provided. The present invention may include storing a volume in a storage device, wherein the stored volume is compressed using an initial compression level. The present invention may also include checking a last access time of the stored volume in the storage device at a regular interval. The present invention may further include, in response to determining, based on the checked last access time, that the stored volume is not accessed at the regular interval, recompressing the stored volume in the storage device using a higher compression level, wherein the higher compression level includes a higher compression ratio than a compression ratio associated with the initial compression level.

Automatic objective-based compression level change for individual clusters

An embodiment of the invention may include a method, computer program product and system for saving data received from a host computing device to a storage system. The storage system includes at least one processor and at least one storage. An embodiment may include storing the received data to the storage on a record basis. A record includes a record header including information indicative of an implemented compression method of the record. An embodiment may include monitoring a processing load of the at least one processor. In response to the processing load being less than a predetermined level, an embodiment may include further compressing the record utilizing a high-ratio compression method based on the record requiring further compression. An embodiment may include updating the record header information to reflect details of the utilized a high-ratio compression method. An embodiment may include storing the further compressed record to the storage.

Data compression utilizing low-ratio compression and delayed high-ratio compression

A computer-implemented method according to one embodiment includes creating journal entries in response to performing predetermined operations on a sequential storage medium, storing the journal entries in a memory in response to creation thereof for creating an operation journal, and upon occurrence of a predefined event, saving the operation journal. A computer program product according to another embodiment includes a computer readable storage medium having program instructions embodied therewith. The computer readable storage medium is not a transitory signal per se. The program instructions are readable and/or executable by a controller to cause the controller to perform a method including creating, by the controller, journal entries in response to performing predetermined operations on a sequential storage medium. The journal entries are stored, by the controller, in a memory in response to creation thereof for creating an operation journal. The operation journal is saved upon occurrence of a predefined event.

Rollback on a sequential storage medium to a specific point in time

In one embodiment, a method includes selectively invalidating data stored in at least one cache line of a cache memory in response to a determination that a predetermined amount of time has passed since the at least one cache line was last accessed. The predetermined amount of time is shorter than a round-trip time to process a plurality of blocks of data stored sequentially to a ring buffer. In other embodiments, methods, systems, and computer program products are described for efficient use of cache memory using an expiration timer.

Efficient cache memory having an expiration timer

In one embodiment, a method includes selectively invalidating data stored in at least one cache line of a cache memory of a processor in response to a determination that a predetermined amount of time has passed since the at least one cache line was last accessed. The predetermined amount of time is shorter than an average round-trip time for the processor to process a plurality of blocks of data stored sequentially to a ring buffer. In other embodiments, methods, systems, and computer program products are described for efficient use of cache memory using an expiration timer.

In a storage system including plural source storage devices, a target storage device selects which source storage device to accept a copy request from the target storage device so as to minimize the load on the entire system. The system calculates first and second load values for job loads being processed. System load values for the system are derived from job load value of a specific data, and respective load values for first and second source storage devices. The system compares the system load values to select a storage device to provide the data copy so as to minimize the load on the entire system.

Selecting a virtual tape server in a storage system to provide data copy while minimizing system job load

A computer-implemented method for storing data in a storage area, includes: storing a first data unit in a first area of the storage area, in response to a request to store a first data unit having a first attribute in the storage area, when at least one data unit having the first attribute is stored in the first area; and generating, a second area by reducing the first area, when no data unit having the second attribute is stored in the storage area in response to a request to store a second data unit having a second attribute in the storage area; furthermore, storing the second data unit in the second area.

Storing data in storage area

A method can include transmitting a first data from a first adapter to a buffer of a channel adapter device driver at a buffer memory transfer rate. The channel adapter device driver also receives a second data at a first port of the first adapter from a host at a first time. The method also includes determining a second time to send a device end status to the host, the device end status closes a channel from the host to the first adapter. The method also includes sending the device end status to the host at the second time through the first port. The method also includes transferring the second data from the first adapter to the buffer of the channel adapter device driver.

Delay mechanism on fibre channel

A worldwide unique identifier (WWUID) is newly assigned to a file upon the creation or update of the file and is inherited from a file to a copied file when the file is copied. In a backup apparatus, a file name reception unit receives the file name of a backup target file. A WWUID reception unit receives a WWUID corresponding to the file name. A WWUID search unit searches for the same WWUID in backup management information of a previous day stored in a backup destination. Only if the search is failed, a file operation instruction unit instructs the storing of the backup target file into the backup destination. Then, an Rcnt update instruction unit instructs the updating of the number of references made to the WWUID within the backup destination. A second management information update instruction unit then instructs the updating of backup management information of the current day.

File deduplication in a file system

Systems and methods for backing up storage volumes are provided. One system includes a primary side, a secondary side, and a network coupling the primary and secondary sides. The secondary side includes first and second VTS including a cache and storage tape. The first VTS is configured to store a first portion of a group of storage volumes in its cache and migrate the remaining portion to its storage tape. The second VTS is configured to store the remaining portion of the storage volumes in its cache and migrate the first portion to its storage tape. One method includes receiving multiple storage volumes from a primary side, storing the storage volumes in the cache of the first and second VTS, and migrating a portion of the storage volumes from the cache to storage tape in the first VTS.

Systems and methods for backing up storage volumes in a storage system

A method, and apparatus configured to perform such method, according to various embodiments, includes writing data stored in a buffer onto a recording medium using a write head in a first round of writing. An interval marker is written on the recording medium in the first round of writing when the buffer is empty. Next data is written onto the recording medium after the interval marker in the first round of writing. Data is written in an area of the interval marker in a second round of writing performed subsequent to the first round.

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Tokyo, Japan

Eiji Tosaka