Incremental disk backup system for a dynamically mapped data sto

Details Incremental disk backup system for a dynamically mapped data sto Incremental disk backup system for a dynamically mapped data sto

1990-09-12

1993-05-11

Atkinson, Charles E.

Boots, shoes, and leggings

3642851, 364DIG1, 36494391, 3649443, 364DIG2, 371 101, G06F 1120

Patent

active

052108660

ABSTRACT:
The parallel disk drive array data storage subsystem dynamically maps between virtual and physical data storage devices and schedules the writing of data to these devices. The data storage subsystem functions as a conventional large form factor disk drive memory, using an array of redundancy groups, each containing N+M disk drives. The data storage subsystem does not modify data stored in a redundancy group but simply writes the modified data as a new record in available memory space on another redundancy group. The original data is flagged as obsolete. A mapping table is maintained to identify portions of these redundancy groups which contain newly written or modified virtual track instances. These marked virtual track instances are written to backup medium as a background process and the mapping table is updated to clear the flags that identify these virtual track instances as having been modified.

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