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US 2003/0191840 A1Published application
Shared storage device and method for updating contents of the same
AssigneeHitachi, Ltd.
InventorFrederico Buchholz Maciel
Life of this patent
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AssigneeHitachi, Ltd.
InventorFrederico Buchholz Maciel
Estimating the term…
A storage apparatus and a storage method for decreasing the number of storage devices shared by a plurality of servers for reduced size and power consumption and for updating storage contents by preventing services from being degraded. A first virtual volume includes a plurality of storage devices and saves the same data in part or all of the storage devices. A virtualization engine detaches a storage device from the first virtual volume and generates a second virtual volume from the detached storage device. The virtualization engine further detaches a storage device from the first virtual volume and moves the detached storage device to the second virtual volume. The virtualization engine writes the difference between data saved in the first and second virtual volumes to the moved storage device.
A storage method comprising the steps of:
A storage device comprising:
Dependencies are inferred from the claim text.
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Information retrieval; Database structures therefor; File system structures therefor: file systems; File servers
Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols: network security protocols
In which an application is distributed across nodes in the network: for accessing one among a plurality of replicated servers
For accessing one among a plurality of replicated servers: access to distributed or replicated servers, e.g. using brokers
Term end not estimated
The present invention relates to a storage mechanism and more particularly to the update of contents stored in shared storage.
Normally, a data center connected to the Internet has a plurality of layers.
FIG. 15 shows the configuration of the so-called front-end layer, i.e., the layer nearest to the Internet. A load balancer 51 distributes accesses from Internet 50 to a plurality of servers 501 through 505.
FIG. 1 is the schematic configuration diagram of a Web site showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram showing the state in which virtual volumes are generated in a shared storage device and one storage device is moved;
FIG. 3 is an explanatory diagram showing the state in which another storage device is moved to the generated virtual volume;
An embodiment of the present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 shows an example of the present invention applied to a Web site (hereafter referred to as a site). The Web side has a load balancer (path control means) 51, a storage device 1, and a managing server 40. The load balancer 51 distributes accesses from Internet 50 to a plurality of servers (information processing devices) 521 through 525. The storage device 1 stores contents provided by the servers 521 through 525. The managing server 40 manages the servers 521 through 525 and the storage device 1.
In FIG. 1, the servers 521 through 525 have no storage devices. Instead, the servers 521 through 525 share the shared storage device 1. The storage device 1 contains a virtual volume 21 storing contents of the Web site. Each of servers 521 through 525 accesses the virtual volume 21. The servers 521 through 525 and the shared storage device 1 are connected via an internal network 52.