Red Hat, Inc.

Jeffrey E Moyer

Vivek Goyal

A method includes providing an interposition driver, and context switching into a kernel associated with a persistent memory using the interposition driver to create a consistent view of the persistent memory.

Kernel software RAID support for direct-access file systems

A method comprises detecting a write fault associated with a first page of a first plurality of pages of a first persistent memory and resolving the write fault. The method further comprises writing, in response to resolving the write fault, data to the first page. The method further comprises context switching, by a processing device, into a kernel associated with the persistent memory to provide a write confirmation to a client device requesting the data be written. The method further comprises updating, in response to the context switching, a parity block associated with the first page. The method further comprises providing, in response to updating the parity block, the write confirmation to the client device.

Kernel software raid support for direct-access file systems

Mirrored byte addressable storage is disclosed. For example, first and second persistent memories store first and second pluralities of pages, both associated with a plurality of page states in a mirror state log in a third persistent memory. A mirror engine executing on a processor with a processor cache detects a write fault associated with the first page of the first plurality of pages and in response, updates a first page state to a dirty-nosync state. A notice of a flush operation of the processor cache associated with first data is received. The first data becomes persistent in the first page of the first plurality of pages after the flush operation; then the first page state is updated to a clean-nosync state. The first data is then copied to the first page of the second plurality of pages; then the first page state is updated to a clean-sync state.

Mirrored byte addressable storage

A mechanism for yielding input/output scheduler to increase overall system throughput is described. A method of embodiments of the invention includes initiating a first process issuing a first input/output (I/O) operation. The first process is initiated by a first I/O scheduling entity running on a computer system. The method further includes yielding, in response to a yield call made by the first I/O scheduling entity, an I/O scheduler to a second I/O scheduling entity to initiate a second process issuing a second I/O operation to complete a transaction including the first and second processes, and committing the transaction to a storage device coupled to the computer system.

Yielding input/output scheduler to increase overall system throughput

A mechanism for performing automated data integrity verification testing for file systems is described. A method of embodiments of the invention includes initiating a temporary termination of connection between a computer system and a storage medium that is coupled to a file system. The method further includes restoring the connection between the computer system and the storage medium, transmitting data records including transactions indicating data blocks reported to have been committed to the storage device, and facilitating data verification testing at the computer system, the data verification testing including reconciling the data records with contents of files of the file system. The data records represent data blocks that are notified as being committed to the storage medium, and the contents of the files represent data blocks actually committed to the storage device.

Performing automated data integrity verification testing for file systems

A computer-implemented method and apparatus for detecting misalignment in a data storage stack by opening a first storage layer in the data storage stack, performing a plurality of accesses of the first storage layer, each of the plurality of accesses starting at a different offset, and determining an optimal offset based on a performance benchmark of each of the plurality of accesses.

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Carlisle, MA, United States of America

Jeffrey E Moyer