| Patent application number | Description | Published |
|---|
| 20080201544 | STORAGE SYSTEM - A processor of a storage controller receives an erasure process request relating to data stored in a storage unit, from a host computer, via a data I/O interface, detects a logical storage extent which is different to the logical storage extent allocated to the storage unit and which can be allocated, allocates the logical storage extent thus detected to the storage unit, sends a notification indicating that access to the storage unit is possible, to the host computer which is the source of the request, and then executes erasure of the data in the logical storage extent that is associated with the storage unit forming the erasure object, and sends a data erasure notification to the management computer when the data has been erased. | 08-21-2008 |
| 20090063596 | BACKUP DATA ERASURE METHOD - According to this invention, a computer system has a host computer, a first storage subsystem providing a first volume, a second storage subsystem providing a second volume for storing a copy of data stored in the first volume. The computer system stores copy configuration information including correspondence between the first volume and the second volume. The management computer transmits the data erasure request to the first storage subsystem upon reception of a first data erasure request for erasing the first volume. The first storage subsystem stops a copying process of data stored in the first volume to the second volume, transmits a second data erasure request for erasing the second volume to the second storage subsystem, and erases the data stored in the first volume. Thus, in the case of erasing data stored in a storage area, corresponding data stored in a destination storage area is also erased so that security risks can be reduced. | 03-05-2009 |
| 20090063797 | BACKUP DATA ERASURE METHOD - A computer system comprises a storage subsystem, a host computer and a management computer, and stores catalogue information containing correspondence between a first volume for data reading or writing and a second volume for storing a copy of the data stored in the first volume. The management computer requests the storage subsystem to erase the data stored in the first volume upon reception of an erasure request of the data stored in the first volume. The storage subsystem erases the data stored in the first volume. The management computer specifies a second volume for storing the copy of the data stored in the first volume based on the catalogue information. The storage subsystem erases data stored in the specified second volume. Thus, security risks are reduced by erasing data regarding the data when the data stored in the volume is erased. | 03-05-2009 |
| 20090216973 | COMPUTER SYSTEM, STORAGE SUBSYSTEM, AND DATA MANAGEMENT METHOD - To prevent, when data is erased from a storage system that stores differential of updated data, a large amount of differential data from being created, a storage subsystem provides a first storage area which stores data, and includes a second storage area which stores a replication of data stored in the first storage area. When the data stored in the first storage area is updated, the data is replicated to the second storage area before the data is updated. When a request to erase the data stored in the first storage area is received, replication of unupdated data to the second storage area is suspended and the data stored in the first storage area is erased based on the request to erase the data. | 08-27-2009 |
| 20100049916 | POWER-SAVING-BACKUP MANAGEMENT METHOD - A storage subsystem includes: a controller; a first logical storage area corresponding to a RAID group configured by a plurality of storage devices; and a second logical storage area corresponding to a plurality of the RAID groups each configured by the plurality of storage devices, and storing a copy of data stored in the first logical storage area. In the storage subsystem, the first and second logical storage areas form a copy group, and for starting copying from the first to second logical storage area, the controller performs a mode change, from a power saving mode to a ready mode, to the plurality of storage devices configuring the plurality of RAID groups corresponding to the second logical storage area. With such a storage subsystem, the time can be reduced for activating copy-destination storage devices to which a power saving function is applied, and the copy time is thus favorably reduced. | 02-25-2010 |
| 20100082935 | COMPUTER SYSTEM AND CAPACITY MANAGEMENT METHOD OF COMPUTER SYSTEM - It is necessary to install a program called an agent in order to keep track of how much a file system on a computer uses a disk. On this account, loads might be applied to a server due to installation work or the agent program to increase primary costs. In addition, software inside a storage device determines and records a target block for data input/output and keeps track of capacity utilization, which might degrade the input/output performance of the storage device. A computer system is provided in which configuration information and operating information are acquired from a storage device, when data input/output is made from a computer to a logical unit, it is determined that the computer uses the logical unit to which input/output is made, and capacity used by the computer is computed. | 04-01-2010 |
| 20100205371 | STORAGE SYSTEM - The threshold excess is judged by a peak value, and therefore, since the threshold excess is judged by a value of high-workload IO of backup or the like that is designed on the assumption that the workload of storage is high, whether the performance limit has been reached remains uncertain. Furthermore, although an optimistic prediction trend with low workload trend and a pessimistic prediction trend with high pessimistic workload trend are presented, LUs that require improvement remain uncertain. Moreover, the time to improve the configuration and the effect of the improvement remain uncertain, and therefore, an improved configuration cannot be determined. | 08-12-2010 |
| 20110029739 | Storage system and control method for the same, and program - The present invention provides a criterion for determining whether or not to apply de-duplication processing. That is, by setting a reduction effect threshold to control switching the de-duplication between ON and OFF, the present invention allows operation such that the de-duplication is applied for a volume for which a high capacity-reduction effect is provided by the de-duplication processing, and in contrast, the de-duplication is not applied to maintain performance for a volume for which a low capacity-reduction effect is provided by the de-duplication processing. | 02-03-2011 |
