Patent ID: 6952699

Claim:
A method of migrating data from at least one original host storage system to a replacement host storage system, comprising: connecting a replacement host storage system to an original host storage system; retrieving, through the replacement host storage system, Access Control Lists, for data, directories or files on the original host storage system file system to be migrated to the replacement host storage system; for data, directories or files that are moved or renamed on the replacement host storage system, storing on the replacement host storage system the original location of said data, directories or files on the original host storage system; building a database at the replacement host storage system indicative of what data, directories or files have been migrated from the original host storage system; and said method further comprising as part of migrating; a) determining if the data to be migrated is a file or a directory, b) if the data is a file, storing the data in the replacement host storage system file system, and updating data migration information in the database of the replacement host storage system to indicate more data has been migrated and stored, and c) if the data is a directory, creating files and subdirectories in the replacement host storage system based on information returned from the original host storage system, creating new records in the database in the replacement host storage system for all newly created files and directories based on information from the original host storage system, and updating information in the replacement host storage system database to indicate that the data has been fully copied.