Reserve/release control method

• US 20050278539A1
• Filed: 07/30/2004
• Published: 12/15/2005
• Est. Priority Date: 06/11/2004
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Shimozono, Norio, Honda, Kiyoshi
• Granted Patent: US 7,272,852 B2
• Time in Patent Office: Days
• US Class Current: 713/182
• CPC Class Codes: G06F 21/6218 to a system of files or objects, e.g. local or distributed file system or database
• CPC Class Codes: G06F 21/80 in storage media based on magnetic or optical technology, e.g. disks with sectors preventing unauthorised reproduction or copying of disc-type recordable media G11B20/00

Abstract

For example, a second storage device as a target device is shared by a first storage device, for example, as a host computer or a client as a privileged device. The target device manages an access permission ID for identifying the access permission to the target device, executes processing to give an access permission to the privileged device or client who requests the access permission, and judges whether to give access permission for the access request after this, according to the access permission ID.

Claims

1. A reserve/release control method for a target device accessed by a host computer, the method comprising steps of:

managing an access permission ID for identifying the access permission to a local device;

transmitting the access permission ID to a host computer when permitting an access permission request from the host computer; and

judging the access permission by using the access permission ID added in association with the access request for the access request from the host computer.

2. A reserve/release control method according to claim 1,

wherein the target device is a storage device accessed from a plurality of host computers and the storage device manages a plurality of access permission ID'"'"'s, and

wherein the target device gives different access permission ID'"'"'s to the plurality of access permission request from the host computer and transmits them to the host computer.

3. A reserve/release control method according to claims 1, further comprising a step of updating the access permission ID in the target device.

4. A reserve/release control method according to claim 3, further comprising a step of updating the access permission ID held by the local device when a request for invalidating the access permission ID is received from the host computer for which the access permission request has been permitted.

5. A reserve/release control method according to claim 4, further comprising a step of issuing, by the host computer, an access permission request to the target device prior to issuing an access request to the target device and acquiring an access permission ID which is added by the target device when permitting the access permission request.

6. A reserve/release control method according to claim 2, further comprising a step of issuing, by the host computer, an access request added by the access permission ID acquired in advance when the host computer issues an access request to one of the storage devices.

7. A reserve/release control method according to claim 1, which a system including the target device includes a plurality of first storage devices functioning as clients which receive and execute an access request from the host computer and a second storage device functioning as the target device, the method further comprising steps of:

issuing, by the host computer, a copy command added by the access permission ID acquired from the second storage device to the first storage device; and

executing, by the first storage device, the copy command and transmitting the data stored in the first storage device to the second storage device for which access is permitted by the access permission ID.

8. A system comprising;

a first device;

a second device connected to the first device via a network, and

a host computer connected to the first and the second device via the network,

wherein the host computer issues an access permission request to the second device prior to issuing an access request to the first device and issues an access request to the first device by using an access permission ID for identifying the access permission acquired when the access permission request is permitted;

wherein the second device manages the access permission ID for identifying the access permission to the second device and, when permitting the access permission request from the host computer, gives the access permission ID to the host computer and judges the access permission by using the access permission ID associated with the access request for the access request from the host computer, and

wherein the first device executes the process for the second device according to the access request from the host computer.

9. A system according to claim 8, further comprising a management device connected to the network,

wherein the management device executes registration, deletion, and updating of the access permission ID managed by the second device.

10. A system according to claim 8, wherein the host computer consists of a plurality of host computers executing an application program,

wherein the first device is a primary storage having a recording medium for storing data,

wherein the second device is a secondary storage having a recording medium for storing data, i.e., a copy of data stored in the recording medium of the first device,

wherein the host computer issues a copy command added by the access permission ID acquired from the secondary storage to the primary storage, and

wherein the primary storage executes the copy command, thereby transmitting data to the secondary storage.

11. A system according to claim 10,

wherein when data copy from the primary storage to the secondary storage is complete, the host computer executes an access control process requesting the secondary storage to invalidate the access permission ID acquired previously.

12. A system according to claim 10,

wherein the first and the second device have a recording medium for storing data and a plurality of volumes as logical storage units are formed on the recording medium;

and

wherein the host computer holds as the access permission management information, information indicating the second device as the access permission control object, a volume ID for identifying the volume, an access permission ID notified when access is permitted, an ID of the first device as the access object for identifying the device which has issued the access request to the second device.

13. A system according to claim 10,

wherein the first and the second device have a recording medium for storing data and a plurality of volumes as logical storage units are formed on the recording medium, and

wherein the first devices holds as the access permission management information, an ID for identifying the second device as the access permission control object, a volume ID for identifying the volume, an access permission ID notified when access is permitted, and an ID for identifying the host computer which has notified the access permission ID to the first device.

14. A system according to claim 10,

wherein the first and the second device have a recording medium for storing data and a plurality of volumes as logical storage units are formed on the recording medium, and

wherein the second devices holds as the access permission management information, a volume ID for identifying the volume as an access permission control object, an access permission ID notified when access is permitted, and an ID of the first device registered as a first device to be accessed, and an ID for identifying the host computer which has notified the access permission ID.

15. A storage system comprising:

a first storage device connected via a network to a host computer; and

a second device connected to the host computer and to the first storage device,

wherein the first storage devices comprises;

a memory for storing a command processing program for processing an access request command from the host computer;

a CPU for executing the command processing program; and

a recording medium having a plurality of volumes formed as logical storage units for storing data,

wherein the second storage device comprises;

a memory for storing a command processing program for processing an access request from the first storage device and an access permission control program executing access permission control processing to the host computer prior to the processing of the access request from the first storage device and updating the access permission ID according to the processing result;

a CPU for executing the command processing program and the access permission control program; and

a recording medium having a plurality of volumes formed as logical storage units for storing data,

wherein the memory of the second storage device holds access management information including a volume ID for identifying a volume to be access-permission-controlled, an access permission ID notified when the access is permitted, an ID of the first device registered as a first device to be accessed, and an ID of the access permission device identifying the device to which the access permission ID is notified,

when the host computer issues a copy command added by access permission management information acquired from the second storage device, to the first storage device,

wherein the CPU of the first storage device executes the copy command from the host computer and performs processing for transferring the data stored in the recording medium to the second storage device,

wherein the CPU of the second storage device manages access ID for identifying the access permission to the CPU itself and when the CPU permits the access permission request for the access permission request from the host computer, the CPU gives the access permission management information to the host computer, performs access permission judgment by using the access permission ID associated with the access request for the access request from the host computer, and executes processing for storing the data transferred from the first storage device to the recording medium.