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Asynchronous remote mirror image method based on load selfadaption in SAN system

An adaptive and mirroring technology, applied in the field of network storage, which can solve the problems of high bandwidth of synchronous mirroring, high system cost, poor performance, etc.

Inactive Publication Date: 2004-11-03
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 2. Synchronous mirroring requires high bandwidth and needs to be implemented with the support of high-speed networks such as Fiber Channel using the FCP protocol, which leads to a relatively simple implementation method of synchronous mirroring and high costs for the entire system
Some companies' products use a low-speed network as a remote mirroring channel, but they need to use FCP to iSCSI bridging conversion, which is expensive and has poor performance

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  • Asynchronous remote mirror image method based on load selfadaption in SAN system
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  • Asynchronous remote mirror image method based on load selfadaption in SAN system

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Embodiment Construction

[0043] The asynchronous remote mirroring method based on load self-adaptation proposed by the present invention is designed and implemented based on the massive network storage system TH-MSNS independently developed by Tsinghua University. TH-MSNS is a SAN architecture, but it is different from the usual SAN architecture. In the usual SAN structure, the storage system is basically implemented by the Fiber Channel array controller. The Fiber Channel array controller is an integrated Fiber Channel chip, cheap Redundant Disk Array (RAID) chip, Small Computer System Interface (SCSI) Or fiber channel interface chip and single board computer (SBC) with embedded CPU and memory; it is connected to fiber switch and hub (HUB) through fiber channel interface, and connected to SAN; the back end is connected to SCSI through SCSI interface or fiber channel interface Hard disk or fiber channel hard disk (using FC-AL interface); generally speaking, the fiber channel array controller provides ...

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Abstract

An asynchronous remote mirror image method based on load self-adapting in SAN system characterizes that in SAN composed of a host node, an interconnection device including a host adaptive card, an exchanger and data link, I / O node and its disk array, a mirror I / O node providing network disks to the above mentioned I / O node and its disk array, the target simulator of the I / O nodal unit can apply two different asynchronous mirror image ways to reduce the command response time according to I / O load and to synchronize the disks to ensure the compatibility of data at the beginning of setting up the mirror image relation or exchange the fault disks when they fail and process the faults of the submodules of the target simulator differently so as to reduce the response time of writing command.

Description

technical field [0001] An asynchronous remote mirroring method based on load self-adaptation in a SAN system belongs to the technical field of network storage. Background technique [0002] As a key technology of SAN (Storage Area Network), remote data mirroring makes full use of the long-distance connection capability and unified storage characteristics of SAN's middle and bottom network (FC or Ethernet), ensuring that important data is protected from regional physical disasters (such as fire, fire, etc.) The availability after floods and large-scale power failures, etc.) provides strong support for data disaster recovery. [0003] At present, the remote mirroring solution of the SAN system mostly adopts the method of synchronous mirroring. Synchronous mirroring means that all write operations to mirrored disks or logical volumes will send commands / data to the mirrored disk (or logical volume) pair at the same time, and will be notified only after the write commands of the...

Claims

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Application Information

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IPC IPC(8): H04L12/24H04L12/26H04L12/28H04L29/06
Inventor 舒继武郑纬民严瑞姚骏
Owner TSINGHUA UNIV