The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2019
Filed:
Oct. 27, 2017
Emc Ip Holding Company Llc, Hopkinton, MA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
Load balancing in a mapped RAID data storage system that moves slices of logical unit (LUN) address space between non-volatile storage represented by different rotation groups of RAID extent entries in a RAID extent table. The RAID extent table is divided into RAID extent groups corresponding to partnership groups of drives, and the RAID extent groups are divided into rotation groups. At least one LUN with an address space made up of slices is generated for each RAID extent group. Host data directed to each slice is stored in drive extents indicated by the RAID extent entries in the rotation group to which the slice is mapped. A rebalancing operation modifies the mapping between slices in a LUN and the rotation groups in the corresponding RAID extent group such that at least one slice is remapped from a heavily loaded rotation group to a lightly loaded rotation group.