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1. (WO2018085163) MULTI-LAYER MERGE IN A STORAGE VIRTUALIZATION SYSTEM

Pub. No.:    WO/2018/085163    International Application No.:    PCT/US2017/058922
Publication Date: Sat May 12 01:59:59 CEST 2018 International Filing Date: Tue Oct 31 00:59:59 CET 2017
IPC: G06F 17/30
Applicants: MICROSOFT TECHNOLOGY LICENSING, LLC
Inventors: HAVEWALA, Sarosh C.
BRENDER, Scott A.
CHAGANI, Shaheed
Title: MULTI-LAYER MERGE IN A STORAGE VIRTUALIZATION SYSTEM
Abstract:
The state of a file may be a combination of local state, typically small (e.g., a placeholder file), and some external source state such as that maintained in a read-only namespace managed by a cloud provider or by another local file system, typically large. A file system component responsible for overlaying (i.e., merging) the partial local state and the external source state into a single file system view that can be used by an application of a container as if the full state exists locally. Overlays that comprise the file system state may be referred to as "layers". A tombstone mechanism may be provided to record delete or rename modifications in the top layer.