BACKUP SERVER SELECTION BASED ON DATA COMMONALITY

摘要

Techniques of backing up data stored on host computing devices involve selecting a backup server from among multiple servers on which to back up host data based on a measure of commonality between the host data and data stored in the backup servers. Prior to sending data for backup, a host sends a set of host data representations to a backup system. Each host data representation is based on a respective hash value computed from a respective block of the host data. The backup system compares the set of host data representations with server data representations for each backup server and computes a commonality score for each backup server. The backup system then selects a backup server on which to place the host data based at least in part on the commonality scores. Host data are then directed to the selected backup server for backup.