Storage control device and access control method

• US 20050262084A1
• Filed: 06/28/2004
• Published: 11/24/2005
• Est. Priority Date: 05/07/2004
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Tomita, Aki
• Application Number:
  US10/876,694
• Publication Number:
  US 20050262084A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0655 Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

In a case where an object ID unique to a region in a disk drive is included in a read request coming from a client terminal, first management means is provided for content reading from the region indicated by the object ID in the disk drive. In the case of a unique ID which is unique to the content and exhibits some change every time its corresponding content is updated, second disk management means is provided for making access to the disk drive based on the unique ID to execute an access request.

Claims

1. A storage system, comprising:

one or more of a storage device storing an object containing a collection of data; and

a storage control device for controlling access to the object stored in the storage device, wherein

the storage control device further comprises;

first storage management means for, when a read request coming from an external device includes an object ID unique to a region in the storage device, reading an object from the region indicated by the object ID in the storage device for passing the object to the external device; and

second storage management means for, when an access request coming from the external device includes a unique ID that is unique to the object and changes every time the object is updated, accessing the storage device based on the unique ID to execute the access request.

2. A storage system according to claim 1, wherein

the first and second storage management means have each different communications port for communications with the external device.

3. A storage system according to claim 2, further comprising

communications control means for passing a request coming from the external device to the first storage management means when the request includes an object ID and to the second storage management means when the request includes a unique ID.

4. A storage system according to claim 3, wherein

the second storage management means further comprises a content management table storing an interrelation between the unique ID and the object ID, wherein

when the read request coming from the external request includes the unique ID, the second storage management means refers to the content management table to find an object ID corresponding to the unique ID, and reads the object stored in the region indicated by the object ID in the storage device for passing the object to the external device.

5. A storage system according to claim 4, wherein

the first storage management means further comprises an object ID management table storing, in an interrelated manner, a pre-update object ID of a new object and a post-update object ID of an update object corresponding to the new object, wherein

when the read request coming from the external device includes the pre-update object ID, the first storage management means refers to the object ID management table to find the latest post-update object ID interrelated to the pre-update object ID, and reads an object written into a region indicated by the latest post-update object in the storage device for transmission to the external device.

6. A storage system according to claim 5, wherein

when the read request coming from the external device includes either the pre-update object ID or the post-update object ID, and when information is included asking for the object in the region indicated by the pre-update object or the post-update object, the first storage management means selects the pre-update or post-update object ID, and selects from the object ID management table the latest post-update object ID interrelated to the pre-update or post-update object ID when included is information asking for the object in the region indicated by the latest post-update object ID.

7. A storage system according to claim 1, wherein

the second storage management means further comprises a content management table storing an interrelation between the unique ID and the object ID, wherein

when a new object comes from the external device responding to a creation request, the second storage management means generates a pre-update unique ID for the new object for storage into the content management table, generates a pre-update object ID for the pre-update unique ID for storage into the content management table, stores the new object to a position indicated by the pre-update object ID in the storage device, and transmits the pre-update unique ID and the pre-update object ID to the external device.

8. A storage system according to claim 7, wherein

after receiving an object update request including the update object and the pre-update unique ID from the external device, the second storage management means generates a post-update unique ID for the update object for storage into the content management table, generates a post-update object ID for the post-update unique ID for storage into the content management table, and stores the update object to a position indicated by the post-update object ID in the storage device for transmission to the external device.

9. A storage system according to claim 8, wherein

the second storage management means transmits the pre-update object ID to the first storage management means when the pre-update object ID is generated, and the post-update object ID to the second storage management means when the post-update object ID is generated, wherein

the first storage management means further comprises an object ID management table storing a pre-update object ID for a new object, and a post-update object ID for an update object corresponding to the new object in an interrelated manner, wherein

the first storage management means stores the pre-update object ID and the post-update object ID coming from the second storage management means to the object ID management table in an interrelated manner, and when the read request coming from the external device includes the pre-update object ID, refers to the object ID management table to find the latest post-update object interrelated to the pre-update object ID, and in the storage device, reads an object written into a region indicated by the found latest post-update object ID for transmission to the external device.

10. A storage system, comprising:

one or more of a storage device storing an object containing a collection of data; and

a storage control device for controlling access to the object stored in the storage device, wherein

the storage control device further comprises;

a processor;

memory; and

a plurality of ports for connection with another device over a network, wherein

when a read request coming from the another device through the port includes an object ID unique to a region in the storage device, the processor reads an object from the region in the storage device indicated by the object ID for transmission to the another device over the network, and

when the read request includes a unique ID being unique to the object and showing a change when the object is updated, the processor makes access to the storage device based on the unique ID to read the object corresponding to the unique ID for transmission to the another device, wherein

the memory stores information indicating an interrelation between the unique ID and the object ID, wherein

when the read request coming from the another device includes the unique ID, the processor refers to the information to find the object ID corresponding to the unique ID, and reads the object written into the region in the storage region indicated by the found object ID for transmission to the another device.

11. A data access method in a storage system including one or more of a storage device storing an object containing a collection of data, the method comprising:

a first step of, when a read request coming from an external device includes an object ID unique to a region in the storage device, reading an object from the region indicated by the object ID in the storage region for transmission to the external device; and

a second step of, when an access request coming from the external device includes a unique ID being unique to the object and showing a change when the object is updated, making access to the storage device based on the unique ID to execute the access request.

12. A data access method according to claim 11, wherein

the second step further comprises the steps of:

referring to, when the read request from the external device includes the unique ID, a content management table storing an interrelation between the unique ID and the object ID to acquire an object ID corresponding to the unique ID; and

reading the object written into the region in the storage region indicated by the object ID for transmission to the external device.

13. A data access method according to claim 12, wherein

the first step further comprises the steps of:

referring to, when the read request coming from the external device includes an object ID, an object ID management table storing information interrelating an object ID of an arbitrary object to another object ID to be created when the arbitrary object is updated (in the below, “

post-update object ID”

) to extract the latest post-update object ID interrelated to the object ID; and

reading the object written into the region in the storage device indicated by the latest update object ID for transmission to the external device.

14. A data access method according to claim 13, wherein

the first step further comprises the steps of:

when the read request coming from the external device includes the object ID, and when information is included asking for an object of a region indicated by the object ID, selecting the object ID; and

when information included is asking for the object in the region indicated by the latest post-update object ID, extracting from the object ID management table the latest post-update object ID interrelated to the object ID.

15. A data access method according to claim 11, wherein

the second step further comprises the steps of:

generating, when receiving a new object from the external device responding to a write request, a unique ID for the new object for storage into the content management table;

generating an object ID corresponding to the unique ID for storage into the content management table; and

storing the new object to a position indicated by the object ID in the storage device, and transmitting the unique ID and the object ID to the external device.

16. A data access method according to claim 15, wherein

the second step further comprises the steps of:

generating, when an update object is received together with the unique ID from the external device responding to an object update request, a unique ID for the update object (hereinafter, “

post-update unique ID”

) for storage into the content management table;

generating an object ID for the post-update unique ID (hereinafter, “

post-update object ID”

) for storage into the content management table; and

storing the update object to a position indicated by the post-update object ID in the storage device for transmission to the external device.

17. A data access method according to claim 16, wherein

the first step further comprises the steps of:

storing, to the object ID management table, the object ID and the post-update object ID generated in the second step in an interrelated manner;

referring to, when the read request coming from the external device includes the object ID, the object ID management table to find the latest post-update object ID interrelated to the object ID; and

reading the object written into the region indicated by the latest post-update object ID in the storage device for transmission to the external device.

18. A data access method according to claim 17, wherein

the second step further comprises the steps of:

storing, to the content management table, the unique ID of the new object and the post-update unique ID of the update object corresponding to the new object in an interrelated manner;

storing the object ID in the content management table in an interrelated manner to the unique ID, and storing the post-update object ID to the content management table in an interrelated manner to the post-update unique ID; and

when an ID list request comes from the external device for the unique ID or the object ID, extracting based on the ID list request, from the content management table one or more of a unique ID interrelated to each other, or one or more of an object ID interrelated to each other, and transmitting the unique ID or the object ID to the external device.

19. A data access method according to claim 18, wherein

the second step stores to the content management table both attribute information of the new object interrelated to the unique ID of the new object, and attribute information of the update object interrelated to the post-update unique ID of the update object, and when the ID list request coming from the external device for the unique ID or the object ID is asking for a specific attribute, based on the ID list request, extracts from the content management table one or more of an interrelating unique ID satisfying the attribute asked in the ID list request, or one of more of an interrelating object ID satisfying the attribute asked in the ID list request, and transmits the unique ID or the object ID to the external device.

20. A data access method according to claim 19, wherein

in the second step, when an object ID request comes from the external device asking for the object ID corresponding to the unique ID, the object ID corresponding to the unique ID is extracted from the content management table for transmission to the external device.