Supporting write operations during a fingerprint upgrade process for cluster file systems

A system updating fingerprints for deduplicated data segments in a cluster network utilizing containers to hold directory and files of a filesystem, comprising:

• a first calculator calculating, for each container in the cluster network, new fingerprint hash values using a new hash process that replaces an old hash process that generated old fingerprint hash values;
• a system component producing new containers as needed to store the new fingerprint hash values;
• a new index mapping component creating a new index mapping from the old hash process to the new hash process, and a new fingerprint index mapping from the new hash process to the containers, and generating, by using the new fingerprint index, new data fingerprints with the new fingerprint hash;
• a second calculator calculating the new fingerprint hash values of the new data segments using the new hash process;
• and
• a deduplication backup server deduplicating data segments fingerprinted using the new hash process;
• and
• a storage storing the deduplicated data segments in storage with the new hash process and the new fingerprint index mapping.

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 of updating fingerprints for deduplicated data segments in a cluster network utilizing containers to hold directory and files of a filesystem, comprising:

• calculating, for each container in the cluster network, new fingerprint hash values using a new hash process that replaces an old hash process that generated current fingerprint hash values;
• storing the new fingerprint hash values in newly produced containers;
• creating a new index mapping from the old hash process to the new hash process, and a new fingerprint index mapping from the new hash process to the containers;
• generating, by using the new fingerprint index, new fingerprints with the new hash process;
• calculating the new fingerprint hash values of the new fingerprints using the new hash process for storage in the new containers;
• deduplicating data segments fingerprinted using the new hash process;
• and
• storing the deduplicated data segments in storage with the new hash process and the new fingerprint index mapping.