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Delaying Deletion and Restoration of Slice Data when a Delete Intention is Provided

IP.com Disclosure Number: IPCOM000247826D
Publication Date: 2016-Oct-06
Document File: 1 page(s) / 20K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a process to accommodate cases in which a requester wants to reverse the decision to delete data in a Dependable Systems and Networks (DSN) memory.

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Delaying Deletion and Restoration of Slice Data when a Delete Intention is Provided

Sometimes requesters re-think decisions to delete data from a memory.

The novel contribution is a process to accommodate cases in which a requester wants to reverse the decision to delete data in a Dependable Systems and Networks (DSN) memory.

The DSN memory may institute either an explicit or an implicit grace period , during which time the delete request may be recalled and reversed. For example, when processing a delete, undo, or finalize request, a DS unit may mark the affected slice as deleted, but nonetheless retain the slice data for some period. This may be due to an explicit policy of retention, a write-once-read-many (WORM) or versioning configuration, or due to the nature of the underlying storage format (e.g., files that are not truly erased until overwritten, or bin files in a packed storage format remain until the bin is compacted). If the requester decides to "undelete" a slice that remains restorable, then the DS unit can recover the slice content and update metadata indicating the slice as deleted. Otherwise, it returns an error indicating that the slice is no longer recoverable (e.g., because it has been overwritten or otherwise finally erased).

This method can be used by a higher level application to implement recycle bin semantics, through which content can be marked for deletion, but may later be taken out of the recycle bin, so long as at least an Informatio...