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Dot Hill Announces New Patents on Data Safeguards

LONGMONT, Colo. July 26, 2011

The 79th U.S. patent awarded to Dot Hill is for a method for efficiently deleting obsolete snapshots. After a controller receives a command to delete a snapshot, the Dot Hill invention checks to see if all other snapshots associated with the same backing store (snapshot repository) are either being deleted or marked for deletion. If it is determined that all such snapshots are either being deleted or marked for deletion, the invention forgoes deleting only the requested snapshot and instead re-initializes the entire backing store – thus saving time compared to alternative approaches that delete only a single snapshot at a time.

The company’s 78th U.S. patent 7,975,115 provides an efficient way to manage storage snapshots. A storage snapshot is a set of reference markers, or pointers, to data stored on a disk drive, tape, or in a storage area network (SAN). Snapshots streamline access to stored data and can speed up the process of data recovery.

By creating two separate areas, one for "Preserve Data" and another for "Write Data," which is a working copy of the snapshot, Dot Hill’s patented innovation allows users to always be able to return to the specific point in time when the snapshot occurred and recover the original data. Preserved data is never overwritten, so that it preserves the original data pointers as they were at the time of the snapshot.

These two patented approaches are featured in Dot Hill’s AssuredSnap software, which offers a reliable and convenient means of backing up and recovering vital data in the event of disaster. Dot Hill offers enterprise class Data Management Software including AssuredCopy™, AssuredSnap, and AssuredRemote™.

Dot Hill’s 77th U.S. patent 7,921,301 provides a method and system for safeguarding information commonly stored on removable storage devices. The invention uses a simple method of local encryption which can be implemented within the array controller to protect data between the controller and cache data, or between the controller and the array data. This simple encryption scheme does not require CPU-intensive data encryption algorithms that can slow down data access. This Dot Hill innovation can be implemented with simple, low-cost hardware, does not slow down reads or writes, and works in redundant configurations.


Jim Kuenzel

About Dot Hill

Longmont, Colo. China Germany India Israel Japan Singapore United Kingdom the United States


Certain statements contained in this press release regarding matters that are not historical fact are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by the statements. Forward-looking statements include the availability and performance of current or future Dot Hill product features based on the patented technology described in this press release, any competitive advantage that the patents and technology provide to Dot Hill, any positive effect on Dot Hill’s financial results or increase in the value of Dot Hill as a company due to the patents or other intellectual property, and Dot Hill’s ability to continue to receive patent protection on current or future technology. The risks that contribute to the uncertain nature of the forward-looking statements include: any unforeseen technological, intellectual property, supply or engineering issues, and changing customer preferences. However, there are many other risks not listed here that may affect the future business of Dot Hill, as well as the forward-looking statements contained herein. To learn about such risks and uncertainties, you should read the risk factors set forth in Dot Hill’s public filings with the SEC, including the Forms 8-K, 10-K and 10-Q most recently filed by Dot Hill. All forward-looking statements contained in this press release speak only as the date on which they were made. Dot Hill undertakes no obligation to update such statements to reflect later events or circumstances.

Steve Sturgeon

[email protected]

Company Contact:
Ruth Macdonald

[email protected]

SOURCE Dot Hill Systems Corp.

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