Writable virtual disk of read-only snapshot file objects

Details Writable virtual disk of read-only snapshot file objects Writable virtual disk of read-only snapshot file objects

2003-04-11

2008-11-25

Peikari, B. James (Department: 2189)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S020000, C714S006130, C711S162000

Reexamination Certificate

active

07457982

ABSTRACT:
A technique enables creation and use of a writable, read-only snapshot of an active file system operating on a storage system, such as a multi-protocol storage appliance. The writable, read-only snapshot comprises a read-only “image” (file) residing in a snapshot and a writable virtual disk (vdisk) residing in the active file system. The writable vdisk is a “shadow” image of the snapshot file image and, as such, includes an attribute that specifies the snapshot file as a backing store.

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