Non-disruptive and efficient migration of data across cloud providers

A system for migrating data of a deduplication file system from a source to destination storage tier comprising:

• a processor;
• and memory configured to store one or more sequences of instructions which, when executed by the processor, cause the processor to carry out the steps of:
• maintaining an index associating fingerprints of file segments to container numbers of containers within which the file segments are stored;
• at a start of migration, creating a boundary identifying a current container number;
• packing at least a subset of file segments at the source storage tier into a new container to be written to the destination storage tier;
• generating a new container number for the new container;
• updating the index to associate fingerprints of the at least subset of file segments to the new container number;
• receiving a request to read a file segment;
• and
• querying the index with a fingerprint of the file segment to determine whether the request should be directed to the source or destination storage tier based on a container number of a container within which the file segment is stored.

A computer program product, comprising a non-transitory computer-readable medium having a computer-readable program code embodied therein, the computer-readable program code adapted to be executed by one or more processors to implement a method for migrating data of a deduplication file system from a source to destination storage tier comprising:

• maintaining an index associating fingerprints of file segments to container numbers of containers within which the file segments are stored;
• at a start of migration, creating a boundary identifying a current container number;
• packing at least a subset of file segments at the source storage tier into a new container to be written to the destination storage tier;
• generating a new container number for the new container;
• updating the index to associate fingerprints of the at least subset of file segments to the new container number;
• receiving a request to read a file segment;
• and
• querying the index with a fingerprint of the file segment to determine whether the request should be directed to the source or destination storage tier based on a container number of a container within which the file segment is stored.