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Managing metadata for data in a copy relationship

a technology of copy relationship and metadata management, applied in memory system, memory adressing/allocation/relocation, instruments, etc., can solve problems such as mismatch

Inactive Publication Date: 2012-10-04
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This mismatch may occur if at the time of the withdraw operation, target metadata for modified target tracks in cache is destaged to the target storage before the modified target tracks.

Method used

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  • Managing metadata for data in a copy relationship
  • Managing metadata for data in a copy relationship
  • Managing metadata for data in a copy relationship

Examples

Experimental program
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Embodiment Construction

[0018]FIG. 1 illustrates an embodiment of a storage server 2 coupled to a source storage 4a and a target storage 4b. The storage server 2 includes a processor 6 and a memory 8 having an Input / Output (I / O) manager 10, copy relationship information 12, a modified data structure 14, and a cache 16. The copy relationship information 12 provides a relationship information for each instance of a copy operation to copy source data 18a in the source storage 4a to target data 18b in the target storage 4b. The target and source data 18a, 18b specified for the copy relationships 12 may comprise tracks, logical block addresses (LBAs), volumes, or any other units of data known in the art. The I / O manager 10 manages the copying of source data 18a to target data 18b as part of a copy relationship 12, and manages I / O access to the target storage 4b from a host 22, connected to the server over network 20. The source 4a and target 4b storages may further maintain source metadata 24a and target metada...

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PUM

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Abstract

Provided are a computer program product, system, and method for managing metadata for data in a copy relationship copied from a source storage to a target storage. Information is maintained on a copy relationship of source data in the source storage and target data in the target storage. The source data is copied from the source storage to the cache to copy to target data in the target storage indicated in the copy relationship. Target metadata is generated for the target data comprising the source data copied to the cache. An access request to requested target data comprising the target data in the cache is processed and access is provided to the requested target data in the cache. A determination is made as to whether the requested target data in the cache has been destaged to the target storage. The target metadata for the requested target data in the target storage is discarded in response to determining that the requested target data in the cache has not been destaged to the target storage.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a computer program product, system, and method for managing metadata for data in a copy relationship.[0003]2. Description of the Related Art[0004]In a storage environment, source volumes may be mirrored to target volumes to provide redundant copies of data. The source and target volumes may be in different storage devices to provide further redundancy. A point-in-time copy replicates data in a manner that appears instantaneous and allows a host to continue accessing the source volume while actual data transfers to the copy volume are deferred to a later time. The point-in-time copy appears instantaneous because complete is returned to the copy operation in response to generating the relationship data structures without copying the data. The point-in-time copy relationships that are immediately established in response to the point-in-time copy command include a bitmap or other data struct...

Claims

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Application Information

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IPC IPC(8): G06F12/16G06F12/08
CPCG06F11/0727G06F11/0793G06F12/126G06F12/16G06F12/0871G06F12/0891
Inventor BENHASE, MICHAEL T.BROWN, THERESA M.GUPTA, LOKESH M.LI, SUGUANGLIPETS, MARK L.MELLGREN, CAROL S.TODD, KENNETH W.
Owner IBM CORP