No assignee for this patent application has been made.
Reporters obtained the following quote from the background information supplied by the inventors: "RAID systems store and access multiple, heterogeneous individual hard drives as if the array were a single, larger disk. Distributing data over these multiple disks reduces the risk of losing the data if one drive fails and it also improves access time. RAID was developed for use in transaction or applications servers and large file servers. Currently, RAID is also utilized in desktop or workstation systems where high transfer rates are needed.
"Systems today are often sold with a small number of drive types, typically with different performance characteristics (e.g., HDD & SSD). Over time, drive technology changes and different capacities of drives become available. For these or other reasons, clients may end up with a variety of drive capacities--for example a mixture of 300 GB and 600 GB drives.
"Most RAID algorithms require that drives in the same array share the same capacity. This means that if, in the example, a 600 GB drive fails, then a 300 GB drive cannot be used as a 'hot spare' drive (wherein a hot spare drive can be used to restore redundancy in the event of a drive failure) because its capacity is too small.
"A first solution to this problem is to maintain separate pools of 300 GB and 600 GB spare drives. The drawback to this solution is that more spare drives may be required due to different capacities than would be required from a coverage plan based purely on reliability. For example, 300 GB spares cannot be used once all 600 GB spare drives are used up if a 600 GB drive fails.
"A second solution to this problem is to provision purely 600 GB spare drives that can cover both array sizes. The drawback to this solution is that space is wasted when a 600 GB spare drive replaces a 300 GB drive. Further, a 600 GB spare drive is typically the most expensive (fastest and largest) type of drive in the system. US 20080109601 discloses systems and methods for RAID Restriping. One method includes selecting an initial RAID device for migration based on at least one score, creating an alternate RAID device, moving data from the initial RAID device to the alternate RAID device, and removing the initial RAID device."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "Provided are a system, computer program, and method for restoring redundancy in a storage group when a storage device in the storage group fails. In response to detecting a failure of a first storage device in a storage group, wherein the storage group stores each of a plurality of extents in the first storage device and a second storage device to provide redundancy, a determination is made whether a spare storage device that has a storage capacity less than that of the storage group. One of the extents in a storage location in the second storage device that is beyond an upper limit of positions in the spare storage device is moved to a new storage location. The spare drive is incorporated into the storage group to provide redundant storage for the storage group, wherein the extents in the storage group are copied to the spare drive.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 depicts a representation of a prior art storage virtualisation system;
"FIG. 2 depicts a representation of a modified storage virtualisation system according to the preferred embodiment;
"FIG. 3-6 depict a representation of a number of storage components of the system of FIG. 2; and
"FIGS. 7a and 7b are flow charts showing the operational steps involved in a process according to the preferred embodiment."
For more information, see this patent application: Bartlett, Eric J.; Fairhurst, Matthew J. Restoring Redundancy in a Storage Group When a Storage Device in the Storage Group Fails. Filed
Keywords for this news article include: Patents.
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC
Most Popular Stories
- Koch Brothers Step up Anti-Obamacare Campaign
- Obama Administration Releases Proposal to Regulate For-Profit Colleges
- Elizabeth Vargas' Husband Marc Cohn Addresses Rumors
- Quiznos Files for Chapter 11
- FDIC Sues Big Banks Over Rate Manipulation
- U.S. to Relinquish Gov't Control Over Internet
- Keurig Adds Peet's coffee, Alters Starbucks deal
- Vybz Kartel Convicted of Murder
- SoCalGas Reaches Record Spend on Diversity Suppliers
- U.S. Consumer Sentiment Falls in Early March