摘要:
This invention relates to data backup and data recovery in a computer system. An outputting unit updates data stored in a first area based on an update request of data from the host computer, a creating unit stores update data for the update request in a second area, a marker processing unit creates a marker containing information of the range, in which the data is stored, and information indicating whether or not the data is allowed to be stored in a third area based on a request of creating the marker from the host computer to store the created marker in the second area, and a reflecting unit refers to the marker, obtains the update data corresponding to the data storing range, which is stored prior to the marker, and reflects the obtained update data to the third area.
摘要:
This invention relates to data backup and data recovery in a computer system. An outputting unit updates data stored in a first area based on an update request of data from the host computer, a creating unit stores update data for the update request in a second area, a marker processing unit creates a marker containing information of the range, in which the data is stored, and information indicating whether or not the data is allowed to be stored in a third area based on a request of creating the marker from the host computer to store the created marker in the second area, and a reflecting unit refers to the marker, obtains the update data corresponding to the data storing range, which is stored prior to the marker, and reflects the obtained update data to the third area.
摘要:
There is provided a computer system which can implement ease of transition to a standby state caused by power-off of a volume and ease of recovery from a standby state while maintaining access performance. A computer system including a storage system (200) having one or more disk units (220) and a disk controller unit (210) which controls reading and writing of data stored on volumes formed by the disk units and a host computer (100) which transmits a data read/write request to the storage system (200), wherein the host computer (100) gives an instruction to perform volume assignment for each of groups each having duplicated sets obtained by multiply duplicating a set composed of one or more volumes on which data is to be stored, and the storage system (200) assigns a first volume of a first duplicated set in the group to one of the disk units (220) which has an attribute different from an attribute of a volume constituting another duplicated set.
摘要:
When a storage system receives a request from a host computer to read data from a logical unit, the storage system selects a logical device from which data is to be read, in accordance with the power supply status and power-off time for each logical device allocated to the logical unit, turns on the power supply for the selected logical device, and reads data from that device. When the storage system receives a request from a host computer to write data to a logical unit, it turns on the power supply for each logical device allocated to the logical unit and performs multiplex-writing of data for each logical device.
摘要:
There is provided a computer system which can implement ease of transition to a standby state caused by power-off of a volume and ease of recovery from a standby state while maintaining access performance. A computer system including a storage system (200) having one or more disk units (220) and a disk controller unit (210) which controls reading and writing of data stored on volumes formed by the disk units and a host computer (100) which transmits a data read/write request to the storage system (200), wherein the host computer (100) gives an instruction to perform volume assignment for each of groups each having duplicated sets obtained by multiply duplicating a set composed of one or more volumes on which data is to be stored, and the storage system (200) assigns a first volume of a first duplicated set in the group to one of the disk units (220) which has an attribute different from an attribute of a volume constituting another duplicated set.
摘要:
A data storing system include a first and second storage system, each including a cache memory and a disk drive, and a third storage system coupled to the first and second storage systems and including a third disk drive to provide a third logical volume based on the third disk drive. First and second write data is transmitted from the first storage system to the second storage system according to copy pair management information. A certain storage system, which is one of the first and second storage systems, destages the second write data from a cache memory of the certain storage system to the third logical volume in the third storage system according to a volume and storage conversion table in the certain storage system.
摘要:
The object of the invention is to prevent differential data transfer for a volume pair from being stopped by the influence of another volume pair and make the loads on physical paths equal to each other by finding an optimum allocation of the physical paths to logical paths. A storage network system includes a host computer 10 and a plurality of storage subsystems 20, and the host computer 10 or a storage subsystem 20 checks a pair status of a volume pair consisting of a source logical volume 26p and a target logical volume 26s, determines a coefficient value uniquely determined from the pair status as a load value of the volume pair, determines a sum of load values of volume pairs belonging to the group to which the source volume belongs as a group load value, and allocates a number of physical paths corresponding to the group load value and a plural-group load value, which is a sum of the load values of a plurality of groups, to the volume pairs belonging to the group as a logical path, which is a virtual communication link.
摘要:
A computer system and method which stores path definition information including a storage ID, a volume ID, and validities of paths between a host computer and a first or second storage system identified by the storage ID for accessing a volume identified by the volume ID in one of the storage systems, sends an I/O request via the paths, based on the path definition information, receives information indicating the storage and volume IDs, and updates the path definition information. During initial copying from the second to the first volume, validity corresponding to a first path is set to “Invalid” and validity corresponding to a second path is set to “Valid”. After completion of initial copying, the validity corresponding to the first path included in the path definition information is changed to “Valid.”
摘要:
Related plural logical volumes can be used after switching over from the host computer therein. A switching command, which a host computer sends, makes a storage device search for a switching target volume, from the volume tables, that is identical to identification information of the switching target volume received among switching target candidate volumes that form a volume pair relation with the switching source volume. The storage device memorizes an intra-host ID of the switching target volume and an intra-storage ID of the switching target volume in a switching table with a correspondence there between. The storage device acquires the intra-storage ID of the switching target volume in reference to the switching table in the case of receiving an access request, such that the intra-host ID of the switching source volume is used as a key, and executes switching to access to the switching target volume.
摘要:
A data storing system include a first and second storage system, each including a cache memory and a disk drive, and a third storage system coupled to the first and second storage systems and including a third disk drive to provide a third logical volume based on the third disk drive. First and second write data is transmitted from the first storage system to the second storage system according to copy pair management information. A certain storage system, which is one of the first and second storage systems, destages the second write data from a cache memory of the certain storage system to the third logical volume in the third storage system according to a volume and storage conversion table in the certain storage system.