Synchronizing replicas with media errors in distributed storage systems

A system comprising:

• a data processing apparatus;
• and
• a memory apparatus in data communication with the data processing apparatus and storing instructions executable by the data processing apparatus and that upon such execution cause the data processing apparatus to perform operations comprising:
• receiving a request to transmit a data block from a first data storage device to a second data storage device;
• attempting to read the data block from the first data storage device;
• detecting a media error resulting from the attempt to read the data block from the first data storage device;
• and
• in response to detecting the media error:
• generating a new data block including mismatched checksum data that causes a checksum mismatched error when the new data block is accessed;
• and
• transmitting the new data block for storage at the second data storage device in place of the data block.

A computer storage medium encoded with a computer program, the program comprising instructions that when executed by data processing apparatus cause the data processing apparatus to perform operations comprising:

• receiving a request to transmit a data block from a first data storage device to a second data storage device;
• attempting to read the data block from the first data storage device;
• detecting a media error resulting from the attempt to read the data block from the first data storage device;
• and
• in response to detecting the media error:
• generating a new data block including mismatched checksum data that causes a checksum mismatched error when the new data block is accessed;
• and
• transmitting the new data block for storage at the second data storage device in place of the data block.