Data mirroring between controllers in an active-active controller pair
First Claim
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1. A method for mirroring data using two controllers in a storage system, comprising:
- determining that metadata relating to data to be mirrored by a first controller to a second controller can be sent in a small write mirror message;
providing a first message comprising a write mirror message that includes said metadata relating to data to be mirrored by a first controller to a second controller and in which said first message including said metadata is not greater than 128 bits, with said first message being part of a first mirroring operation, wherein said first message is generated by said first controller, and wherein said first message comprises an initial notification message; and
continuing with said first mirroring operation after said providing a first message by providing a second message comprising a data mirror message that includes user data to said second controller, wherein said first message is associated with a first number of interrupts, wherein in response to determining that metadata cannot be sent in a small write mirror message a second message is sent and is associated with a second number of interrupts, and wherein said first number of interrupts is less than said second number of interrupts.
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Abstract
A data storage system that includes first and second controllers is provided. Data is mirrored from one controller to the other controller according to different steps depending on the amount of data to be mirrored. When the data to be mirrored is less than or equal to a predetermined number of bytes, one less interrupt is generated than when the data to be mirrored is greater than the predetermined number of bits.
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16 Claims
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1. A method for mirroring data using two controllers in a storage system, comprising:
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determining that metadata relating to data to be mirrored by a first controller to a second controller can be sent in a small write mirror message; providing a first message comprising a write mirror message that includes said metadata relating to data to be mirrored by a first controller to a second controller and in which said first message including said metadata is not greater than 128 bits, with said first message being part of a first mirroring operation, wherein said first message is generated by said first controller, and wherein said first message comprises an initial notification message; and continuing with said first mirroring operation after said providing a first message by providing a second message comprising a data mirror message that includes user data to said second controller, wherein said first message is associated with a first number of interrupts, wherein in response to determining that metadata cannot be sent in a small write mirror message a second message is sent and is associated with a second number of interrupts, and wherein said first number of interrupts is less than said second number of interrupts. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for mirroring using two controllers in a storage system, comprising:
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making a determination related to contents of a first message with a first controller, wherein said first message is to be sent by said first controller to a second controller as part of a first mirroring operation, and wherein said first message is a message providing a first notification to the second controller that data will be mirrored to the second controller; and producing said first message having contents that depends on said making step, wherein; 1) when said making step determines that data to be sent comprises less than or equal to a predetermined number of bits such that a small write mirror message can be sent, said first message includes metadata information for user data associated with the first mirroring operation, wherein said first message is associated with a first number of interrupts; and 2) when said making step determines that said data is greater than said predetermined number of bits, at least less than all of said metadata associated with said first mirroring operation is not included with said first message, wherein said first message is associated with a second number of interrupts that is greater than said first number of interrupts. - View Dependent Claims (9, 10, 11)
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12. An apparatus for mirroring data using two controllers in a storage system, comprising:
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a first controller that generates one of a first message and a second message depending on an amount of data to be sent by said first controller to a second controller as part of a first mirroring operation, wherein said first message is sent in response to determining that said amount of data to be sent by said first controller is less than or equal to a predetermined number of bytes, wherein said first message comprises a small write mirror message that includes metadata related to user data included in said first mirroring operation; and a second controller that receives said data from said first controller, wherein when said first or second message is sent by said first controller said first or second message comprises an initial notification message to said second controller related to the first mirroring operation, wherein; when said first message is generated, said first mirroring operation is associated with a first number of interrupts and, when said second message is sent, said first mirroring operation is associated with a second number of interrupts, with said second number of interrupts being greater than said first number of interrupts. - View Dependent Claims (13, 14, 15, 16)
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Specification