摘要:
For realizing an optimum failover in NAS, this invention provides a computer system including: a first computer; a second computer; a third computer; and a storage device coupled to the plurality of computers via a network, in which: the first computer executes, upon reception of an access request to the storage device from a client computer coupled to the plurality of computers, the requested access; and transmits to the client computer a response to the access request; the second computer judges whether a failure has occurred in the first computer; obtains load information of the second computer; obtains load information of the third computer from the third computer; and transmits a change request to the third computer when the obtained load information satisfies a predetermined condition; and the third computer judges whether a failure has occurred in the first computer when the change request is received from the second computer.
摘要:
Provided is a computer system including: one first server; a plurality of second servers; and a plurality of storage subsystems, in which the computer system applies to each file stored in the storage subsystems one of a first file storage mode and a second file storage mode in a distributive manner, the first server integrates directory structures that are unique throughout the respective second servers to provide the integrated directory structures as a directory structure that is unique throughout the computer system to the client computer, and at least one of the first server and the second servers analyzes a utilization state of the file and switches a file storage mode that is currently applied to the file to the other file storage mode based on a change in the analyzed file utilization state.
摘要:
A method of installing software on a storage device controlling apparatus which includes at least one channel controller having a circuit board on which are formed a file access processing section receiving requests to input and output data in files as units from an information processing apparatus via a first network and an I/O processor outputting I/O requests corresponding to the requests to input and output data to a storage device; at least one disk controller executing input and output of data into and from the storage device in response to the I/O requests sent from the I/O processor; and a second network connecting the channel controller and the disk controller so as to be able to communicate with each other, the method comprises the step of writing software for enabling the file access processing section to function, into the storage device by communicating with the channel controller via the second network.
摘要:
A disk array system includes storage devices, a storage device control unit, a connection unit being connected with the storage device control unit, channel control units, a shared memory, and a cache memory. Each channel control unit includes a first processor of converting file data, received through a local area network outside of the disk array system to which the channel control units belongs, into block data and requesting storage of the converted data in the plurality of storage devices and a second processor of transferring the block data to the storage devices through the connection unit and the storage device control unit in response to a request given from the first processor and is connected with the connection unit and the local area network.
摘要:
Provided is a method for controlling a computer system including a first server computer, a second server computer, at least one data storing device, and a client computer. The first server computer manages a first file system. The second server computer manages a second file system. The second file system includes data copied from the first file system. Data written in the second file system after data is copied from the first file system is stored in a shared volume. In the method, when a load on the second server computer is higher than a load on the first server computer, copy of the data stored in the shared volume to the first file system is started and a read request from a client computer is issued to the first server computer. Accordingly, it is possible to execute high-speed distribution of an access load of a storage system.
摘要:
A node 1 and a node 2 are in a mutual failover relationship and share information used in failover through a shared LU. Of filesystems FS1A, FS1B that are mounted at the node 1, the actions of level 1 are allocated to FS1A and the actions of level 2 are allocated to FS1B. The level 1 filesystem FS1A is taken over to the node 2 simultaneously with commencement of failover. The level 2 filesystem FS1B is taken over to the node 2 when an access request for FS1B is generated after commencement of failover. In this way, business services with high availability can be restarted at an early stage.
摘要:
A backup method is provided for use with a storage system composed of a memory which stores a control program, a disk drive having an primary volume, a differential volume, and mapping information, the primary volume storing data sent from a client, the differential volume storing differential data of a snapshot of the primary volume, the mapping information managing the relation between data stored in the primary volume and differential data stored in the differential volume, and a control processor which controls read and write of data in the disk drive. The mapping information is referred to compose the data stored in the primary volume and the differential data stored in the differential volume. The composed data is sent to a backup device.
摘要:
A snapshot management device and snapshot management method whereby a snapshot is obtained on a regular basis, the amount of difference between two obtained snapshots is detected and, when the detected difference amount is smaller than a threshold value, of the two snapshots, the snapshot obtained earlier than the other is deleted, thereby contributing to the improved convenience.
摘要:
A method of controlling a storage control apparatus connected to a host computer via communication unit, receiving a data I/O request transmitted from the host computer, and performing a data I/O process corresponding to the request, includes the following steps of: transmitting a message notifying a start of a process from the storage control apparatus to the host computer when the storage control apparatus executes a process which requires control of a data I/O request transmitted from the host computer, and executing the process by the storage control apparatus after receiving a reply message in response to the aforementioned message.
摘要:
A storage device controlling apparatus includes: a plurality of channel controllers having a circuit board on which are formed a file access processing section receiving requests to input and output data in files as units from an information processing apparatus and an I/O processor outputting I/O requests corresponding to the requests to input and output data to a storage device; and a disk controller executing input and output of data into and from the storage device in response to the I/O requests sent from the I/O processors. In the storage device controlling apparatus, the disk controller performs a replication management processing whereby data is also written into a second logical volume to store a copy of the data in the second logical volume, when the data is written into a first logical volume.