Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Patent
1994-10-26
1997-09-02
Black, Thomas G.
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
39518204, 395616, 395617, 395619, 395622, 711114, 371 4015, G06F 1730, G06F 1300, G06F 1100
Patent
active
056641877
ABSTRACT:
A hierarchic disk array data storage system has multiple storage disks that define a physical storage space and a RAID management system that maps the physical storage space into two virtual storage spaces. The RAID-level virtual storage space presents the physical storage space as mirror and parity RAID areas where the mirror RAID areas store data according to RAID Level 1 and the parity RAID areas store data according to RAID Level 5. The application-level virtual storage space presents the physical storage space as multiple virtual blocks which can be associated with mirror and parity RAID areas. The RAID management system migrates the virtual blocks between the mirror and parity RAID areas to optimize performance and reliability. To select virtual blocks for migration from mirror to parity RAID areas, a frequency distribution table is created to characterize the virtual blocks according to a predetermined distribution criteria. A virtual block is selected by segmenting the frequency distribution table to identify virtual blocks. The application-level virtual storage space is searched until a virtual block that satisfies the selection criterion is located. The located virtual block is then migrated to the parity RAID area.
REFERENCES:
patent: 5155835 (1992-10-01), Belsan
patent: 5195100 (1993-03-01), Katz et al.
patent: 5237658 (1993-08-01), Walker et al.
patent: 5278838 (1994-01-01), Ng et al.
patent: 5287462 (1994-02-01), Jibbe et al.
patent: 5289418 (1994-02-01), Youngerth
patent: 5297258 (1994-03-01), Hale et al.
patent: 5392244 (1995-02-01), Jacobson et al.
patent: 5463776 (1995-10-01), Voight et al.
patent: 5499253 (1996-03-01), Lary
Burkes Theresa A.
Voigt Douglas L.
Black Thomas G.
Hewlett--Packard Company
Lewis Cheryl Renea
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