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Hierarchical RAID Disclosure Number: IPCOM000013250D
Original Publication Date: 2000-Sep-01
Included in the Prior Art Database: 2003-Jun-18

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INTRODUCTION Hierarchical RAID, as the name implies, is a RAID level on top of a RAID level. For example, RAID 10 is RAID 0 on top of RAID 1; RAID 50 is RAID 0 on top of RAID 5; and RAID 00 is RAID 0 on top of RAID 0. The data of the Hierarchical RAID Logical Unit (LUN) is striped across the logical drives below the top RAID level. Hierarchical RAID's goal is to support large arrays for the existent RAID controllers, increase level of fault tolerance, and performance. DESIGN DESCRIPTION