International Business Machines Corporation

Mark B Thomas

Matthew John Fairhurst

Joanna Katharine Brown

William James Scales

Nicholas Howard Jones

Jonathan Paul Kneller

A method for providing redundancy in a virtualized storage system for a computer system is provided. The method includes determining a first set of first logical addresses to provide a virtual storage volume. A redundancy schema is then selected to provide redundancy data for primary data stored in the first set of first logical addresses. A second set of second logical addresses is determined to provide logical storage for the primary data and for the redundancy data. The first set of first logical addresses and the second set of second logical addresses are then mapped and a set of physical addresses is selected from a set of physical storage elements. Mapping between the second set of second logical addresses and the set of physical addresses is then performed to provide physical storage for the primary data and the redundancy data stored in the virtual storage volume.

Providing redundancy in a virtualized storage system for a computer system

A method for providing redundancy in a virtualized storage system for a computer system is provided. The method includes determining first set of first logical addresses to provide a virtual storage volume. A redundancy schema is then selected to provide redundancy data for primary data stored in the first set of first logical addresses. A second set of second logical addresses is determined to provide logical storage for the primary data and for the redundancy data. The first set of first logical addresses and the second set of second logical addresses are then mapped and a set of physical addresses is selected from a set of physical storage elements. Mapping between the second set of second logical addresses and the set of physical addresses is then performed to provide physical storage for the primary data and the redundancy data stored in the virtual storage volume.

A system is provided for transforming an in-use RAID array from a first array configuration having a first parameter to a second array configuration having a second parameter while preserving a logical data structure of the RAID array. The system includes an extent reservation component, and a data migration component for reading unmigrated data from an area of an array arranged according to the first array configuration and writing the data to an area of the array arranged according to the second array configuration using reserved extents to store migrated data. The system also includes a first I/O component for performing I/O according to the first array configuration on unmigrated data prior to its reading by the data migration component, and a second I/O component for performing I/O according to the second array configuration on the migrated data after writing the migrated data.

System and method for transforming an in-use RAID array including migrating data using reserved extents

System and method for transforming an in-use raid array including migrating data using reserved extents

A method for providing redundancy in a virtualized storage system for a computer system is provided. The method includes determining a first set of first logical addresses to provide a virtual storage volume. A redundancy schema is then selected to provide redundancy data for primary data stored in the first set of first logical addresses. A second set of second logical addresses is determined to provide logical storage for the primary data and for the redundancy data. The first set of first logical addresses and the second set of second logical addresses are then mapped and a set of physical storage addresses is selected from a set of physical storage elements. Mapping between the second set of second logical addresses and the set of physical addresses is then performed to provide physical storage for the primary data and the redundancy data stored in the virtual storage volume.

Mechanisms for ensuring data consistency in a data store are provided. The mechanisms access a parity scrub factor f and perform a check on a data group of the data store. The check on the data group includes performing a parity check on a portion of the data group, the portion being equal to 1/of the data group, and performing a data verify on the remainder of the data group. The performing of the check is repeated for the entire data store. An offset factor is used to select the portion of the data group for the parity check. In this case, the offset factor may be incremented when the performance of the check on the data group of the data store has been repeated for the entire data store.

Ensuring data consistency

A method and system for enforcing version control is provided. An embodiment of the method comprises receiving a command to execute code. Code is retrieved from a code management storage and loaded into a controlled storage. The code may comprise test and program components. The code is executed and the results of the executed code are recorded and logged, and the code is removed from the controlled storage. The system includes an interface for receiving the execute code command and is coupled to the controlled storage. A code loader for loading code into the controlled storage may also be provided.

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Southampton, United Kingdom

Mark B Thomas