Patent · US Expired

Using file system information in raid data reconstruction and migration

US7024586B2 · kind B2 · utility

50Cited by
63References
60Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJun 24, 2002
Grant dateApr 4, 2006
Priority date
Expiry dateNov 26, 2022

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG06F11/2094
  • WIPO fieldComputer technology
  • WIPO sectorElectrical engineering

Abstract

On disk failure, the storage system migrates only those disk blocks that included allocated data, and treats unallocated disk blocks as being logically zero when possible. When there is no spare disk, the source data block is logically set to zero and parity is recalculated for the RAID stripe associated with the source data block. When there is a spare, unallocated blocks on the spare are logically or physically set to zero upon migration. Write operations for the failed disk are redirected to other non-failing disks, and a record of which in-use disk blocks have been thus “migrated” to those other non-failing disks in maintained. Unused disk blocks are proactively set to zero. A target mirror copy is created using information regarding allocated disk blocks, by copying those blocks including allocated data or parity, and by clearing at the mirror those blocks not including any allocated data or parity.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.