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Method and apparatus for synchronizing applications for data recovery using storage based journaling

a data recovery and application technology, applied in the field of computer storage, can solve the problems of inability to conveniently, if at all, service any kind of request, and no way to recover data at any point in time, and achieve the effect of facilitating the recovery of the desired data sta

Inactive Publication Date: 2005-01-27
HITACHI LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Benefits of technology

In accordance with an aspect of the present invention, a storage system exposes an application programmer's interface (API) for applications program running on a host. The API allows execution of program code to create marker journal entries. The API also provides for retrieval of marker journals, and recovery operations. Another aspect of the invention, is the monitoring of operations being performed on a data store and the creation of marker journal entries upon detection one or more predetermined operations. Still another aspect of the invention is the retrieval of marker journal entries to facilitate recovery of a desired data state.

Problems solved by technology

Except for database systems, however, there are no ways to recover data at any point in time.
If the data is not in a database system, this kind of request cannot be conveniently, if at all, serviced.

Method used

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  • Method and apparatus for synchronizing applications for data recovery using storage based journaling
  • Method and apparatus for synchronizing applications for data recovery using storage based journaling
  • Method and apparatus for synchronizing applications for data recovery using storage based journaling

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Embodiment Construction

FIG. 1 is a high level generalized block diagram of an illustrative embodiment of a backup and recovery system according to the present invention. When the system is activated, a snapshot is taken for production data volumes (DVOL) 101. The term “snapshot” in this context conventionally refers to a data image of at the data volume at a given point in time. Depending on system requirements, implementation, and so on, the snapshot can be of the entire data volume, or some portion or portions of the data volume(s). During the normal course of operation of the system in accordance with the invention, a journal entry is made for every write operation issued from the host to the data volumes. As will be discussed below, by applying a series of journal entries to an appropriate snapshot, data can be recovered at any point in time.

The backup and recovery system shown in FIG. 1 includes at least one storage system 100. Though not shown, one of ordinary skill can appreciate that the storage ...

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Abstract

Disclosed is a method to synchronize the state of an application and an application's objects with data stored on the storage system. The storage system provides API's to create special data, called a marker journal, and stores it on a journal volume. The marker contains application information, e.g. file name, operation on the file, timestamp, etc. Since the journal volume contains markers as well as any changed data in the chronological order, IO activities to the storage system and application activities can be synchronized.

Description

BACKGROUND OF THE INVENTION The present invention is related to computer storage and in particular to the recovery of data. Several methods are conventionally used to prevent the loss of data. Typically, data is backed up in a periodic manner (e.g., once a day) by a system administrator. Many systems are commercially available which provide backup and recovery of data; e.g., Veritas NetBackup, Legato / Networker, and so on. Another technique is known as volume shadowing. This technique produces a mirror image of data onto a secondary storage system as it is being written to the primary storage system. Journaling is a backup and restore technique commonly used in database systems. An image of the data to be backed up is taken. Then, as changes are made to the data, a journal of the changes is maintained. Recovery of data is accomplished by applying the journal to an appropriate image to recover data at any point in time. Typical database systems, such as Oracle, can perform journali...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F9/00
CPCG06F11/1471G06F2201/84Y10S707/99954
Inventor YAMAGAMI, KENJI
Owner HITACHI LTD
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