Storage area network system
First Claim
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1. A system comprising:
- a computer;
a primary storage system;
a secondary storage system; and
a standby storage system, wherein said computer, said primary storage system, said secondary storage system and said standby storage system are connected to each other by a network, wherein said primary storage system performs a remote copy by performing a write in response to a write request from said computer via said network, and transferring a write command to said secondary storage system via said network, wherein said computer sends the write request to said primary storage system, checks whether the write request has terminated in said primary storage system, and judges whether an error has occurred in said primary storage system or said secondary storage system if the write request has not terminated, wherein, if the error has occurred in said primary storage system, then said computer changes said standby storage system into a new secondary storage system, changes said secondary storage system into a new primary storage system and re-sends the write request to said new primary storage system, and wherein, if the error has occurred in said secondary storage system, then said computer changes said standby storage system into a new secondary storage system and re-sends the write request to said primary storage system.
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Abstract
In remote copy systems connected with a dedicated interface, reliability is reduced for the time until the disk system that caused an error will be recovered. Therefore, when an error occurs in a primary disk system, it is replaced with a standby disk system connected to a storage area network. As a result, a remote copy system with high reliability is obtained.
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Citations
11 Claims
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1. A system comprising:
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a computer;
a primary storage system;
a secondary storage system; and
a standby storage system, wherein said computer, said primary storage system, said secondary storage system and said standby storage system are connected to each other by a network, wherein said primary storage system performs a remote copy by performing a write in response to a write request from said computer via said network, and transferring a write command to said secondary storage system via said network, wherein said computer sends the write request to said primary storage system, checks whether the write request has terminated in said primary storage system, and judges whether an error has occurred in said primary storage system or said secondary storage system if the write request has not terminated, wherein, if the error has occurred in said primary storage system, then said computer changes said standby storage system into a new secondary storage system, changes said secondary storage system into a new primary storage system and re-sends the write request to said new primary storage system, and wherein, if the error has occurred in said secondary storage system, then said computer changes said standby storage system into a new secondary storage system and re-sends the write request to said primary storage system. - View Dependent Claims (2, 3, 4, 5)
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6. A system comprising:
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a computer;
a primary storage system;
a secondary storage system; and
a plurality of standby storage systems, wherein said computer, said primary storage system, said secondary storage system and said standby storage systems are connected to each other by a network, wherein said primary storage system performs a remote copy by performing a write in response to a write request from said computer via said network, and transferring a write command to said secondary storage system via said network, wherein said computer sends the write request to said primary storage system, checks whether the write request has terminated in said primary storage system and judges whether an error has occurred in said primary storage system or said secondary storage system if the write request has not terminated, wherein, if the error is occurred in said primary storage system, then said computer selects one of said standby storage systems, changes said one standby storage system into a new secondary storage system, changes said second storage system into a new primary storage system and re-sends the write request to said new primary storage system, and wherein, if the error has occurred in said secondary storage system, then said computer selects one of said standby storage systems, changes said one standby storage system into a new secondary storage system and re-sends the write request to said primary storage system. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification