专利名称：Method and system for selecting data for
migration in a hierarchic data storage systemusing frequency distribution tables
发明人：Burkes, Theresa A.,Voigt, Douglas L.申请号：EP95110829.9申请日：19950711公开号：EP0709765B1公开日：20021002
摘要：A hierarchic disk array data storage system (10) has multiple storage disks (12)that define a physical storage space (34) and a RAID management system (16) that mapsthe physical storage space (34) into two virtual storage spaces. A RAID-level virtualstorage space (40) presents the physical storage space as mirror and parity RAID areaswhere the mirror RAID areas store data according to RAID Level 1 and the parity RAIDareas store data according to RAID Level 5. An application-level virtual storage space (50)presents the physical storage space as multiple virtual blocks which can be associatedwith mirror and parity RAID areas. The RAID management system (16) migrates thevirtual blocks between the mirror and parity RAID areas to optimize performance andreliability. To select virtual blocks for migration from mirror to parity RAID areas, afrequency distribution table (60) is created to characterize the virtual blocks according toa predetermined distribution criteria. A virtual block is selected by segmenting thefrequency distribution table (60) to identify virtual blocks. The application-level virtualstorage space (50) is searched until a virtual block that satisfies the selection criterion islocated. The located virtual block is then migrated to the parity RAID area.
申请人：HEWLETT PACKARD CO
地址：US
国籍：US
代理机构：Schoppe, Fritz, Dipl.-Ing.
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