Invention Grant
- Patent Title: Allocating RAID storage volumes across a distributed network of storage elements
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Application No.: US14231282Application Date: 2014-03-31
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Publication No.: US09641615B1Publication Date: 2017-05-02
- Inventor: Edward Robins , Kevin E. Granlund , Seema Pai , Evgeny Malkevich , Stephen Richard Ives , Roii Raz , Barak Bejerano
- Applicant: EMC Corporation
- Applicant Address: US MA Hopkinton
- Assignee: EMC IP HOLDING COMPANY LLC
- Current Assignee: EMC IP HOLDING COMPANY LLC
- Current Assignee Address: US MA Hopkinton
- Agency: Anderson Gorecki LLP
- Main IPC: G06F11/00
- IPC: G06F11/00 ; H04L29/08 ; G06F11/20 ; G06F11/10

Abstract:
A distributed network of storage elements (DNSE) is provided in which the physical capacity of each drive is split into a set of equal sized logical splits which are individually protected within the DNSE using separate RAID groups. To reduce restoration latency, members of the RAID groups having a member in common on a given drive are spread within the DNSE to minimize the number of sets of drives within the DNSE that have RAID members in common. By causing the splits to be protected by RAID groups, restoration of the splits may occur in parallel involving multiple drives within the DNSE. By minimizing the overlap between RAID members on various drives, failure of a given drive will not require multiple reads from another drive in the DNSE. Likewise, spare splits are distributed to enable write recovery to be performed in parallel on multiple drives within the DNSE.
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