Abstract:
A.first storage system stores information relating to the updating of data stored in that system as a journal. More specifically, the journal is composed of a copy of data that was used for updating and update information such as a write command used during updating. Furthermore, the second storage system acquires the journal via a communication line between the first storage system and the second storage system. The second storage system holds a duplicate of the data held by the first storage system and updates the data corresponding to the data of the first storage system in the data update order of the first storage system by using the journal.
Abstract:
A storage system comprises a data set storage region or storing a data set containing data and update data for managing this data, and a control section. The data set storage region is divided into a plurality of storage regions including a first storage region and a second storage region. The control section generates a first data set containing first data and first update data which is update data for same, stores at least the first data of this first data set in the first storage region, generates a second data set containing second data and second update data which is update data for same, and stores at least the second data of this second data set in the second storage region, which is separate from the first storage region.
Abstract:
A storage system comprises a data set storage region or storing a data set containing data and update data for managing this data, and a control section. The data set storage region is divided into a plurality of storage regions including a first storage region and a second storage region. The control section generates a first data set containing first data and first update data which is update data for same, stores at least the first data of this first data set in the first storage region, generates a second data set containing second data and second update data which is update data for same, and stores at least the second data of this second data set in the second storage region, which is separate from the first storage region.
Abstract:
The data up to a point of time whereat failure has occurred will be restored at high speed at a remote site without imposing any burden on a host. The first storage system on the master side processes an I/O request from the host, and as a result of I/O processing to the second storage system on the remote side, transmits the update data. The second storage system retains data received from the first storage system as update log data. The host transmits a command for settling a state of an application to the first storage system as data, and the first storage system transmits the data to the second storage system. The host and the second storage system both retain an identifier corresponding to the command, and relate the identifier to the log data. Thereby, the host designates the identifier at any given time, whereby the second storage system restores the data at any given time.
Abstract:
A first storage system stores information relating to the updating of data stored in that system as a journal. More specifically, the journal is composed of a copy of data that was used for updating and update information such as a write command used during updating. Furthermore, the second storage system acquires the journal via a communication line between the first storage system and the second storage system. The second storage system holds a duplicate of the data held by the first storage system and updates the data corresponding to the data of the first storage system in the data update order of the first storage system by using the journal.
Abstract:
A first storage unit system (104a) and a second storage unit system (104b) are connected together via a third storage unit system (104c). When executing a remote copy process, the first storage unit system responds to a write request received from a computer (102a) to transmit to the third storage unit system a journal having write data and address information indicative of a storage position at which the write data is written and requests the third storage unit system to write the journal. The second storage unit system receives control information (107a) issued by the first storage unit system and including the storage position of the journal and on the basis of the control information, reads the journal from the third storage unit system. Then, the second storage unit system follows address information contained in the journal to write the write date contained in the journal to a disk (210b) inside the second storage unit system.
Abstract:
A data processing system (50) includes a first storage system (10) including a first host (100A) and a first storage subsystem (200A). The first host has access to a first copy manager that is operable to manage a data replication operation. A second storage system (20) includes a second host (100B) and a second storage subsystem (200B). The second host has access to a second copy manager that is operable to manage a data replication operation. A first communication link (48) is coupled to the first storage system (10) and the second storage system (20) to exchange management information between the first and second storage systems in order to manage the data replication operation. A data transfer path (68) is configured to transfer data stored in the first storage subsystem (200A) to the second storage subsystem (200B) and replicate the data of the first storage subsystem (200A) in the second storage subsystem (200B). The data transfer path (68) is different from the first communication link (48).
Abstract:
Methods, systems, and configured storage medium are provided for flexible data mirroring. In particular, the invention provides many-to-one data mirroring, including mirroring from local servers (200) running the same or different operating systems and/or file systems at two or more geographically dispersed locations. The invention also provides one-to-many data mirroring, mirroring with or without a dedicated private telecommunications link, and mirroring with or without a dedicated server or another server at the destination(s) to assist the remote mirroring unit(s) (208). In addition, the invention provides flexibility by permitting the use of various combinations of one or more external storage units and/or RAID units to hold mirrored data. Spoofing, SCSI and other bus emulations, and further tools and techniques are used in various embodiments of the invention.