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Consistent updates across storage subsystems

A storage subsystem and subsystem technology, which is applied to the generation of response errors, error detection of redundant data in calculations, instruments, etc., can solve problems such as inability to restore backup copies

Active Publication Date: 2009-04-01
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applications using volumes B1, B2 cannot restore from backup copies stored in volumes B1, B2

Method used

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  • Consistent updates across storage subsystems
  • Consistent updates across storage subsystems
  • Consistent updates across storage subsystems

Examples

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Embodiment Construction

[0028] In the following description, reference is made to the accompanying drawings which form a part hereof, and which illustrate several embodiments. It is understood that other embodiments may be utilized and structural and operational changes may be made.

[0029] IBM's Global Mirror data consistency method for creating consistency groups uses the "data consistency" method to generate consistency groups. In the "data consistent" method, the main control unit issues commands to the auxiliary control units, while the auxiliary control units wait and react to commands received from the main control unit. To start a consistency group, the primary control unit sends a command to the secondary control unit to suspend input / output (I / O) operations. Only after the last secondary control unit completes the I / O operation suspend, the master control unit sends a command to the secondary control unit to allow the write I / O to complete. During this I / O pause, host applications writin...

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Abstract

Provided are a method, system, and article of manufacture, wherein a primary control unit sends a selected time to a plurality of secondary control units. Clocks are periodically synchronized at the primary control unit and the secondary control units with a time server. The primary control unit and the plurality of secondary control units consistently update secondary storage subsystems couplable to the plurality of secondary control units at the selected time.

Description

technical field [0001] The present invention relates to a method, system and article of manufacture for consistent updates across storage subsystems. Background technique [0002] Information technology systems, including storage subsystems, may require protection against site disasters or failures. In addition, information technology systems may require data migration, data backup, or data replication capabilities. Implementation of disaster or failure recovery, data migration, data backup, and data replication may include mirroring or duplicating data in storage systems. An enterprise storage server (ESS) may include one or more processors connected to storage devices, including high-capacity scalable storage devices, redundant array of independent disks (RAID), and the like. An enterprise storage server may include replication functionality to replicate data locally (ie, within an ESS on the same site) or remotely (ie, replicate data to a separate remote site ESS). [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/14G06F17/30
CPCG06F11/1461G06F11/1456G06F11/1464G06F2201/82
Inventor R·F·科恩G·E·麦克布赖德K·W·博伊德G·A·斯皮尔W·F·米奇卡R·F·巴尔特福伊
Owner IBM CORP