Redundant file storage system with parity information

摘要

Some embodiments of the invention shift the responsibility for creating parity and error correction blocks from the hardware or software RAID units or modules to the computer system's file system, allowing the file system's existing mechanisms of write atomicity to be used to help ensure consistency of the on-disk information throughout all or increasing portions of the information saving and/or updating cycle.

主权项

1. At least one storage medium storing instructions that enable a processor based-system to perform operations comprising:
writing first data to a first data block and second data to a second data block; writing first parity information that corresponds to the first and second data; updating the first data with updated first data; and writing second parity information, to third and fourth parity blocks, that corresponds to the first updated data and the second data; wherein the first and second data blocks are included in separate disks and the third and fourth parity blocks are included in separate disks; wherein the first parity data is resident in fifth and sixth parity blocks at the same time the second parity data is resident in the third and fourth parity blocks.