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Designing a product that can withstand inadvertent or careless mistakes on the part of users and help them in a quick recovery (without resorting to some sort of backup ) could be a major contribution.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
76% of the total text.
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"on-demand-recovery" driven design
Designing a product that can withstand inadvertent or careless mistakes on the part
of users and help them in a quick recovery (without resorting to some sort of
backup), could be a major contribution.
There are numerous shortcomings to existing data restoration from backup, but to
mention a few:
Data may not be as recent as one might wish (possible loss of a day's work).
Restoring from backup (especially a central system) is a time-consuming
Backup might be corrupted or inaccessible because of infrequent
Taking unfortunate but inevitable disastrous incidents into account while designing a
product might save the user a lot of grief and expense, and by doing so a company
can also save in support costs and can gain its customers' goodwill.
The 'on-demand-recovery' driven design is more of a mind-set than a specific
algorithm and, as such, has different implementations for different products. An
example for such a design is provision for an "Undelete" functionality. Removing files
under UNIX today results in their resource(s) returning to the free pools. If new files
are created, they could get those "just freed" resources (i.e. pages and inodes). If,
instead, recently removed files or directory resources were not made readily
available to the system but were distributed according to a
FirstRemovedFirstAllocated scheme, a recovery operation could be tried (using
Undelete tools available in the market) t...