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New Storage System

<storage> (NSS) A major Multics implementation project during the 1970s.

The initial Multics file system design had evolved from the one-huge-disk world of CTSS.

When multiple disk units were used they were just assigned increasing ranges of disk addresses, so a segment could have pages scattered over all disks on the system.

This provided good I/O parallelism but made crash recovery expensive. NSS redesigned the lower levels of the file system, introducing the concepts of logical volume and physical volume and a mapping from a Multics directory branch to a VTOC entry for each file.

The new system had much better recovery performance in exchange for a small space and performance cost.

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