No assignee for this patent application, patent application serial number 861453, has been made.
Reporters obtained the following quote from the background information supplied by the inventors: "Data backup is well known. Traditionally, data backup consisted of copying data onto a bulk archival media such as a tape on a periodic basis. Tape backup has been replaced or supplemented more recently by disk redundancy systems. A disk redundant system typically includes at least two storage devices such as disk storage devices in which identical data is stored. If data in one device is lost or damaged as a result of the device malfunctioning or becoming disabled, the data is retrieved from the other device. In order to protect data, redundant systems are sometimes maintained at different geographic locations. That is, in order to protect data stored at a location from system malfunctions, weather disasters or other types of unforeseen conditions, redundant data is stored at different (or remote) physical locations. Data redundancy is also referred to as data mirroring and typically involves the submission of simultaneous 'write' requests to multiple storage devices.
"In mission-critical applications, maintaining synchronization between data at mirrored sites is highly desirable. Synchronization in this context means that all mirrored storage devices must acknowledge receipt of an I/O request from a requesting application before the application may generate the next I/O request. As the distance between the mirrored sites increases, synchronization becomes harder to achieve using existing mirroring techniques and methods as the application generating the I/O request is slowed while awaiting acknowledgement from the remote storage device. Typically, in a data mirroring arrangement, a server is attached or connected to a local data storage device as well as to a remote data storage device with the data from each storage device mirroring that of another. It is possible to obtain synchronization using existing techniques if the physical distance between the mirrored sites is less than approximately twenty-five (25) miles. For greater distances (i.e., greater than twenty-five miles), existing techniques do not provide synchronicity that is needed for maintaining data security in case of a wide-spread calamity."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "Methods and systems consistent with the present invention address this limitation by providing a mechanism through which data may be mirrored in remote storage devices in a near synchronized manner.
"A method consistent with the present invention includes a server determining a predetermined time period (or time interval) associated with a round trip latency between the server and a remote storage device. The server submits a request to a local storage device and to the remote storage device. The server then submits additional requests to the local and the remote storage devices during the predetermined time period. The server determines whether an acknowledgement associated with the request has been received from the remote storage device during the predetermined time period. The server resubmits the request and the additional requests to the remote storage device if an acknowledgement is not received within the time interval. If an acknowledgement is received within the time interval, the server continues to submit additional requests to the local and remote storage devices.
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