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1. (WO2018052780) HIERARCHICAL FAULT TOLERANCE IN SYSTEM STORAGE

Pub. No.:    WO/2018/052780    International Application No.:    PCT/US2017/050302
Publication Date: Fri Mar 23 00:59:59 CET 2018 International Filing Date: Thu Sep 07 01:59:59 CEST 2017
IPC: G06F 11/20
G06F 11/18
G06F 11/14
Applicants: ORACLE INTERNATIONAL CORPORATION
Inventors: MAHESHWAR, Mahanteshwar Chimangala
CHIEN, Hanlin Daniel
BAGAL, Prasad V.
NANDYALA, Harish
WICKREMESINGHE, Rajiv
PIKKILI, Hemanth
AGARWAL, Sahaj
Title: HIERARCHICAL FAULT TOLERANCE IN SYSTEM STORAGE
Abstract:
Embodiments enable a database management system (DBMS) to manage two levels of disk failure groups. These two levels of redundancy are achieved by grouping the disks of the disk group for the DBMS into two levels of failure groups (i.e., "data sites" each containing two or more "failure groups" of disks). This system of disk grouping allows a DBMS to potentially tolerate the loss of both an entire first site and part of a second site. Such a DBMS uses a multi-level voting system, based on both failure group-level votes and site-level votes, to identify the current version of administrative data structures (ADS) that store key administrative data. In addition to data sites that store database data, the DBMS includes a quorum site with a single quorum failure group that stores a copy of the ADS. The quorum site contributes a site-level vote during a multi-level voting event.