Permanent File Backup for the CDC Mass Store System

摘要

The Mass Store system is used to store a large number of user files. Users store files on Mass Store from the NOS/BE machines. The idea behind storage on Mass Store is that a large amount of information can be saved on Mass Store with no worries of reaching full disk capacity. Files that have not been accessed recently are written to cartridge and the disk space is released. Also, there is no limit to how long a file can exist; a file will not be purged due to lack of use. This document is a presentation of a locally designed procedure that ensures that each file stored on Mass Store is also backed up by Mass Store. This procedure replaces the previous method which used standard nine-track tapes as the backup media. Keywords: Computer files; Mass storage; Backup systems; Algorithms.