摘要:
In a storage system that manages update prohibition (WORM) information, when time management is not performed with precision, there arises a possibility that an update prohibition (WORM) attribute may be erased before a preservation period expires. This invention provides a storage system coupled to at least one of time servers through a network, including: a first time information holding unit that holds first time information to be used to manage an update prohibition attribute of data; a second time information holding unit that holds second time information to be used to establish time synchronization with a device coupled to the network; and a time update unit that manages the first time information and the second time information, in which the time update unit receives third time information from the at least one of the time servers and judges whether the third time information satisfies a predetermined condition, and updates the first time information based on the third time information when the third time information satisfies the predetermined condition.
摘要:
A storage group configured by a plurality of storage devices is configured by a plurality of storage sub-groups, and the respective storage sub-groups are configured from two or more storage devices. A sub-group storage area, which is the storage area of the respective storage sub-groups, is configured by a plurality of rows of sub-storage areas. A data set, which is configured by a plurality of data elements configuring a data unit, and a second redundancy code created on the basis of this data unit, is written to a row of sub-storage areas, a compressed redundancy code is created on the basis of two or more first redundancy codes respectively created based on two or more data units of two or more storage sub-groups, and this compressed redundancy code is written to a nonvolatile storage area that differs from the above-mentioned two or more storage sub-groups.
摘要:
One code (a compressed redundant code) is created based on a plurality of first redundant codes, each created on the basis of a plurality of data units, and this compressed redundant code is written to a nonvolatile storage area. This compressed redundant code is used to restore either a data element constituting a multiple-failure data, or a first redundant code corresponding to the multiple-failure data, which is stored in an unreadable sub-storage area of a partially failed storage device, and to restore the data element constituting the multiple-failure data which is stored in a sub-storage area of a completely failed storage device, based on the restored either data element or first redundant code, and either another data element constituting the multiple-failure data or the first redundant code corresponding to the multiple-failure data.
摘要:
Provided is a storage subsystem that can reflect, when merging storage update information and local update information, those two kinds of update information in relevant volumes without overlapping the storage update information and the local update information. When reflecting update information in a storage subsystem 10 and update information in a mobile terminal 14 in relevant volumes, the storage subsystem 10: compares local update information and storage update information based on bitmaps; when both the relevant storage destinations overlap, selects a volume update pattern serving as a storage destination different from the storage destination for the local update information from among plural volume update patterns; and stores the storage update information in a storage area corresponding to the selected volume update pattern, and the mobile terminal 14 stores the storage update information in local storage 102.
摘要:
This storage system includes a plurality of data drives, a plurality of spare drives for storing data stored in at least one data drive among the plurality of data drives as save-target data, one or more RAID groups configured from the plurality of data drives, one or more spare RAID groups associated with the one or more RAID groups and configured from the plurality of spare drives, and a write unit to configured to write the save-target data into the plurality of spare drives configuring the one or more spare RAID groups in the order that the save-target data was read from the at least one data drive.
摘要:
Optimal performance tuning is enabled by avoiding the deterioration in the performance of a storage system caused by an erroneous setting in a tuning parameter. The storage system has a primary volume provided as an operational volume to a host computer, and a secondary volume capable of forming a copy-pair with the primary volume. When the load demanded in executing I/O processing to the secondary volume set with a second tuning parameter is lighter than the load demanded in executing I/O processing to the primary volume set with a first tuning parameter, the storage controller switches the primary/secondary relationship between the primary volume and secondary volume and provides the secondary volume as the operational volume to the host computer.
摘要:
A computer system includes a host computer; a first storage system that processes an I/O request issued by the host computer; and a second storage system that receives host I/O information and performance information from the first storage system and reproduces, based on the host I/O information and performance information, the internal processing conditions of the first storage system at the time the I/O request was processed, thereby simulating the I/O performance of the first storage system.
摘要:
A storage device according to the present invention has a first volume for storing discontinuous data transmitted from a host computer and a second volume for storing continuous data produced by address-converting discontinuous data, and includes: a data storing unit for converting the discontinuous data transmitted from the host computer into the continuous data and storing the continuous data in one of a plurality of third volumes formed by dividing up the second volume; a data management unit for managing transfer target data that has to be transferred from the third to the first volume, from among the discontinuous data stored in the third volume by the data storing unit; and a volume clearance unit for clearing the third volume having the smallest amount of transfer target data managed by the data management unit by transferring the transfer target data in the relevant third volume to the first volume.
摘要:
A television channel selection monitoring apparatus for identifying the broadcast channel to which a television receiver means is tuned at any given time is disclosed. Instead of relying for the channel identification on the local oscillation frequency at the tuner of such television receiver means, the apparatus of the present invention utilizes the recognition of the channel identification number superimposed on the video signal received through the selected channel so that the image of the superimposed channel number may appear, for a certain duration following the channel selection, at a predetermined area of the image corresponding to the video signal.
摘要:
A semiconductor integrated circuit device includes a flat-range voltage supply unit which steps down an external power supply voltage and generates a resultant, flat-range voltage, and a burn-in voltage supply unit which generates a burn-in voltage depending on the external power supply voltage. A switching unit selects either the flat-range voltage or the burn-in voltage, a selected voltage being supplied to an internal circuit. A switching instruction unit includes switches and generates a switching instruction signal by an ON/OFF control of the switches. A switching control unit controls the switching unit in accordance with the switching instruction signal.