Patent number 8631215 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "Write once, read many (WORM) storage is a data storage technology that allows data to be written to storage media a single time and not rewritten thereafter to prevent tampering of the stored data. WORM storage traditionally used optical media, but recent innovations have applied WORM storage to other storage technologies, such as tape storage and hard disk drives. WORM storage has been used for archiving data that requires a long retention period (e.g., medical information), but driven by the recent growth of legislation in many countries, WORM storage is now increasingly being used to archive corporate data, such as financial documents and emails.
"It should be appreciated there are a variety of different implementations of WORM storage, and many WORM storages require the creation of separate aggregates of storage devices for all the different implementations. For example, if three different types of WORM storage implementations are needed, then three different aggregates need to be created. The requirement of separate aggregates for each different type of implementation may result in the inefficient utilization of storage devices. For example, the creation of each aggregate creates a certain Redundant Arrays of Independent Disks (RAID) overhead. Additionally, a minimum of three storage devices are required to create an aggregate in some RAID implementations, such as Double Parity RAID 6, and a typical storage system may not have this number of free storage devices available. Furthermore, a large number of aggregates may not have adequate capacity utilization."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "Embodiments of the present invention provide various techniques for provisioning different types of write once, read many (WORM) states. In general, different types of WORM states can be provisioned within an aggregate of storage devices. In particular, different volumes included in an aggregate can be provisioned with different types of WORM states. As a result, an aggregate can have a particular type of WORM state while its volume can have a different type of WORM state. Therefore, the type of WORM state of an aggregate is decoupled from the type of WORM state of its volume.
"The types of WORM states between a volume and an aggregate can be decoupled by using a particular identifier assigned to a volume. This identifier identifies the type of WORM state of the volume. A separate identifier is used to identify a type of WORM state of an aggregate. The 'volume' identifier may identify a type of WORM state that is different from a type of WORM state assigned to an aggregate. The type of WORM state identified by the 'volume' identifier is applied to the volume and as a result, the modification of data stored in the volume is restricted based on this type of WORM state.
"In addition to decoupling the types of WORM states between an aggregate and its volumes, the volumes themselves may also have different WORM states between each other. As a result, different types of WORM states do not need the creation of separate aggregates for each different type of WORM state. Instead, the different types of WORM states may be created, for example, in different volumes of a single aggregate. The ability to create different types of WORM states within a single aggregate may possibly result in the efficient utilization of storage devices. Additionally, the use of identifiers may possibly simplify the changing of one type of WORM state of a volume or aggregate to a different type by simply changing the existing identifier to a different identifier that identifies a different type of WORM state."
URL and more information on this patent, see: Verma, Pavan; Jaiswal, Anuja. Provisioning Different Types of Write Once,
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