Remapping disk drive I/O in response to media errors

摘要

A method for handling media errors during a read operation on a data storage device. The method comprises detecting that a first file and a second file are duplicates, wherein the first file is stored on a first storage device. Metadata is written to the first storage device in association with the first file, wherein the metadata identifies the location of the second file that is a duplicate of the first file. Later, an application program requests a first read operation to read the first file. In response to a media error that results from the first read operation, the method reads the metadata associated with the first file to identify the location of the second file, performs a second read operation to read the second file instead of the first file, and provides the second file to the application program in satisfaction of the requested first read operation.

主权项

1. A method, comprising:
detecting that a first file and a second file are duplicates, wherein the first file is stored on a first storage device; writing metadata to the first storage device in association with the first file, wherein the metadata identifies the location of the second file that is a duplicate of the first file; an application program requesting a first read operation to read the first file from the first storage device; and in response to a media error that results from the first read operation, reading the metadata associated with the first file to identify the location of the second file, performing a second read operation to read the second file instead of the first file, and providing the second file to the application program in satisfaction of the requested first read operation.