Remote copy method and remote copy system
First Claim
1. A remote copy system comprising:
- a first storage system having a first logical volume accompanied with a first plurality of disk drives in the first storage system;
a second storage system having a second logical volume, which is a virtual volume not accompanied with a second plurality of disk drives in the second storage system, the virtual volume configuring a first remote copy pair with the first logical volume; and
a third storage system having a third logical volume accompanied with a third plurality of disk drives in the third storage system, the third logical volume configuring a second remote copy pair with the virtual volume and storing a copied data of data stored in the first logical volume,wherein, if the first storage system receives a write data sent from a host computer to the first logical volume, the first storage system stores the write data in the first plurality of disk drives and sends the write data to the virtual volume in the second storage system according to a synchronous remote copy procedure,wherein, if the second storage system receives the write data sent from the first storage system to the virtual volume, the second storage system transfers the write data to the third logical volume in the third storage system according to an asynchronous remote copy procedure, andwherein, if the third storage system receives the write data transferred from the second storage system to the third logical volume, the third storage system stores the write data in the third plurality of disk drives.
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Abstract
A remote copy system includes: a first storage system having a first logical volume accompanied with a first plurality of disk drives in the first storage system; a second storage system having a second logical volume, which is a virtual volume not accompanied with a second plurality of disk drives in the second storage system, the virtual volume configuring a first remote copy pair with the first logical volume; and a third storage system having a third logical volume accompanied with a third plurality of disk drives in the third storage system, the third logical volume configuring a second remote copy pair with the virtual volume and storing a copied data of data stored in the first logical volume. If the second storage system receives write data sent from the first storage system to the virtual volume, the second storage system transfers the write data to the third logical volume in the third storage system.
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Citations
24 Claims
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1. A remote copy system comprising:
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a first storage system having a first logical volume accompanied with a first plurality of disk drives in the first storage system; a second storage system having a second logical volume, which is a virtual volume not accompanied with a second plurality of disk drives in the second storage system, the virtual volume configuring a first remote copy pair with the first logical volume; and a third storage system having a third logical volume accompanied with a third plurality of disk drives in the third storage system, the third logical volume configuring a second remote copy pair with the virtual volume and storing a copied data of data stored in the first logical volume, wherein, if the first storage system receives a write data sent from a host computer to the first logical volume, the first storage system stores the write data in the first plurality of disk drives and sends the write data to the virtual volume in the second storage system according to a synchronous remote copy procedure, wherein, if the second storage system receives the write data sent from the first storage system to the virtual volume, the second storage system transfers the write data to the third logical volume in the third storage system according to an asynchronous remote copy procedure, and wherein, if the third storage system receives the write data transferred from the second storage system to the third logical volume, the third storage system stores the write data in the third plurality of disk drives. - View Dependent Claims (2, 3, 4, 5)
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6. A remote copy system comprising:
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a first storage system having a first logical volume; a second storage system having a second logical volume, which is a virtual volume and configures a first remote copy pair with the first logical volume; and a third storage system having a third logical volume, which configures a second remote copy pair with the second logical volume, wherein, if the first storage system receives a write data sent from a host computer to the first logical volume, the first storage system writes the write data to the first logical volume and sends the write data to the virtual volume in the second storage system according to a first remote copy procedure, wherein, if the second storage system receives the write data sent from the first storage system to the virtual volume, the second storage system transfers the write data to the third logical volume in the third storage system according to an second remote copy procedure, the second storage system does not hold a duplicate of the first logical volume in the virtual volume, and wherein, if the third storage system receives the write data transferred from the second storage system to the third logical volume, the third storage system writes the write data to the third logical volume so that the third storage system holds a duplicate of the first logical volume in the third volume. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for remote copy in a remote copy system including a first storage system, a second storage system, and a third storage system, the method comprising:
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providing, by the first storage system, a first logical volume accompanied with a first plurality of disk drives in the first storage system to a host computer; providing, by the second storage system, a second logical volume to the first storage system, the second logical volume managed as a virtual volume not accompanied with a second plurality of disk drives in the second storage system and configuring a first remote copy pair with the first logical volume; providing, by the third storage system, a third logical volume to the second storage system, the third logical volume accompanied with a third plurality of disk drives in the third storage system, configuring a second remote copy pair with the virtual volume, and storing a copied data of data stored in the first logical volume; storing, by the first storage system, in response to receiving a write data sent from the host computer to the first logical volume, the write data in the first plurality of disk drives; sending, by the first storage system, in response to receiving the write data sent from the host computer to the first logical volume, the write data to the virtual volume in the second storage system according to a first remote copy procedure; transferring, by the second storage system, in response to receiving the write data sent from the first storage system to the virtual volume, the write data to the third logical volume in the third storage system according to a second remote copy procedure; and storing, by the third storage system, in response to receiving the write data transferred from the second storage system to the third logical volume, the write data in the third plurality of disk drives. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A second storage system in a remote copy system, the remote copy system including a first storage system, a second storage system, and a third storage system,
the second storage system comprising: -
a second logical volume which is a virtual volume, the virtual volume configuring a first remote copy pair with a first logical volume in the first storage system and a second remote copy pair with a third logical volume in the third storage system; and a controller managing data transfer corresponding to the virtual volume, wherein, if the first storage system receives a write data sent from a host computer to the first logical volume, the first storage system writes the write data to the first logical volume and sends the write data to the virtual volume in the second storage system according to a synchronous remote copy procedure, wherein, if the second storage system receives the write data sent from the first storage system to the virtual volume, the second storage system transfers the write data to the third logical volume in the third storage system according to an asynchronous remote copy procedure, the second storage system does not hold a duplicate of the first logical volume in the virtual volume, and wherein, if the third storage system receives the write data sent from the second storage system to the third logical volume, the third storage system writes the write data to the third logical volume so that the third storage system holds a duplicate of the first logical volume in the third logical volume. - View Dependent Claims (21, 22, 23, 24)
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Specification