System and method for retention of historical data in storage resources

摘要

In accordance with embodiments of the present disclosure, a method may include receiving a read command. The method may also include determining if the read command is a command to read current data or historical data for a given logical address. The method may additionally include reading data stored on a storage resource at a historical physical address defined by a historical data offset associated with the given logical address in response to determining that the read command is a command to read historical data. The method may further include communicating the data stored at the historical physical address as a response to the read command.

主权项

1. A system comprising a storage controller operatively coupled with a non-transitory computer readable medium, the non-transitory computer readable medium including:
a retention mode variable indicating whether the storage controller is configured to retain stale data stored on the non-transitory computer readable medium; an address mapping table, the mapping table comprising:
one or more entries, each entry associating a logical address with a corresponding physical address;for each physical address, a stale variable indicating whether data stored at the physical address is stale;for each physical address, a retain variable indicating whether data stored at the physical address is to be retained if data stored at the physical address is stale; andfor each logical address, a historical data offset, indicating a second physical address at which historical data associated with the logical address is located.