System and method for accessing an offline storage unit through an online storage unit
First Claim
1. A storage system comprising:
- a controller coupled to a host computer;
a plurality of disk drives storing data sent from the host computer;
a plurality of logical volumes relating to at least one of the disk drives;
an online volume of the logical volumes being a target logical volume of a read/write request sent from the host computer; and
an offline volume of the logical volumes being changed to be the target logical volume of said read/write request instead of the online volume based on a command sent from the host computer even when the online volume remains operable,wherein the command sent from the host computer includes a request for accessing the offline volume, andwherein the command includes a first identifier of the online volume and a second identifier of the offline volume.
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Abstract
By the same method as that of making data access to a data storage area in an online state, it is performed to access a data storage area other than the data storage area. A plurality of logical volumes carried by a disk array apparatus includes an online volume that is in an online state to a host and an offline state that is in an offline state to the host. The host transmits an access command including target information designating a target volume to the disk array apparatus as an access command to a starting volume other than the target volume. The disk array apparatus receives the access command to the starting volume and offers the data access to the target volume on the basis of the target information carried by that access command to the host.
59 Citations
11 Claims
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1. A storage system comprising:
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a controller coupled to a host computer; a plurality of disk drives storing data sent from the host computer; a plurality of logical volumes relating to at least one of the disk drives; an online volume of the logical volumes being a target logical volume of a read/write request sent from the host computer; and an offline volume of the logical volumes being changed to be the target logical volume of said read/write request instead of the online volume based on a command sent from the host computer even when the online volume remains operable, wherein the command sent from the host computer includes a request for accessing the offline volume, and wherein the command includes a first identifier of the online volume and a second identifier of the offline volume. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A storage system comprising:
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a controller coupled to a host computer; a plurality of disk drives storing data sent from the host computer; a plurality of logical volumes relating to at least one of the disk drives; an online volume of the logical volumes being a target logical volume of a read/write request sent from the host computer; and an offline volume of the logical volumes being changed to be the target logical volume of said read/write request instead of the online volume based on a command sent from the host computer even when the online volume remains operable, wherein the command sent from the host computer includes a request for accessing the offline volume, and wherein the command includes an instruction that the target logical volume is the offline volume. - View Dependent Claims (8, 9, 10, 11)
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Specification